Select different cart66 products

I'm wondering if there is a hook, etc that might help me work around this limitation with cart66... I sell prints of artwork, up to large sizes. This means my shipping costs vary widely. I love using gravity forms to select the various frame and image options, it has really been great. But when someone selects a size option, I have no way of changing the cart66 shipping dimensions.

What I'm wondering is this... if I set up a different cart66 product for each size option, and then I could force/specify/dynamically populate which image will be used for the size, that'd work great. So, is there a way to create a Gravity form which allows me to select between different cart66 products? Basically, a form which redirects to another form...? EG: a dropdown that says small, medium, and large. Each of those options is a gravity form attached to a cart66 product. I could create a hidden/single option field which I could dynamically populate or "preselect" with which image would be used in that size.

I realize this isn't a cart66 support forum, but you guys have been able to really nail down so many different possibilities I figured I'd ask here first.

I think I just found the answer to this question here:
http://www.gravityhelp.com/forums/topic/conditional-logic-redirect

Anyone have any advice?

What about in cart66 product settings in Product Variations,eg Small, Medium Frame +$2.00, Large Frame +$4.00

Would that work for you?

OK. I got the redirect working using the thread that was referenced. That is so cool.

One more question though, is there anyway to get the redirect to work, while also passing other data? Like, using "size" to control the redirect, but also pass "color"? EG using something like this: imagesize={Size:1}&imagecolor={color:2}
I can get the redirect working, but I can't seem to dynamically populate with the additional string info...

Making progress, but could still use some help. I've been able to add a second $_GET to the redirect template, which accurately gets the second field I'm passing in the query string.
I added it in the switch, something like this:

$size = $_GET['imagesize'];
$image = $_GET['imageselect'];
	switch ($size)
	{
		case "8 x 10 inches":
		// if 8 x 10 inches redirect to the following page
		header("Location: http://my-domain.com/8-x-10-canvas-print/?image=$image");
		break;

And the url works... I end up with a url like this: http://my-domain.com/8-x-10-canvas-print/?image=field-label-of-the-field-i-want
It shows the label, not the value. Which I don';t really care what it shows. WHat I do care about, is that the"Image" field on that page is not populating. The "allow dynamic..." is selected, and the parameter is set to "image" but it doesn't populate or select.

I feel like I'm so close and yet so far...

Carl, my question really has nothing to do with Cart66... I am trying to use Gravity Forms ONLY in this procedure... Cart66 only set the limitations/parameters for what I need to do. Nor has the inability for this to work so far for me got anything to do with Cart66. In this scenario, Cart66 would only be involved after the FINAL form submission. At which point, I wouldn't ask you guys for any help.

I'm trying to use a Gravity form to select specific pages/posts which have a separate form on them. I've accomplished this. However, I would also like to pass some values/data from that original form to the next after the redirection. If you like, I will go back and edit out any mention on Cart66 and my question still stands.

Thanks, this is really helpful. The first half of what you said I've got down. Except the documentation about merge tags, I had missed that, I'll look into it now and see what I've missed.

I had a feeling this might be a cause of some confusion... the parameter "image" won't actually be an image file. It is the specific label / parameter name of my dropdown field. The site will sell art work with various sizes and framing options, so image, doesn't apply to a filetype or field type, but a choice in a dropdown: IE, your "image" could be Mona Lisa, Sistine Chapel, American Gothic, etc. I'm not trying to actually pass upload field data or an actual image.

I know my explanations earlier weren't the clearest. I am going to set up a page to sell a particular painting. One of the ones I'm selling is called "Vilnius" The first form, called Choose Size, and allows customers to select the size they would like to purchase. On this same form will be a dropdown with a list of ALL the images I sell. I will use shortcodes to preselect which image it will be.
[gravityform id=25 name=ChooseSize field_values='image=vilnius']
This way, I can already determine which particular picture they are buying, they only can change the size. This allows me to create fewer forms as I won't need a form for each painting in each size.

This form will then redirect to another page for all pictures of that size, with a form called "Select a Frame". On this form, I have created another dropdown, visible only to admin, where I need to pass that "preselection" of the painting "Vilnius" from the first form, through the redirect, to this form.

I certainly don't expect anyone to write my code, you guys have already posted most of what I needed which is a heck of a lot more helpful than the forum for the other plugin I mentioned in this thread. I've been able to use what Chris pointed to, to make most of this work. My concern is that there has to be a step I'm screwing up or missing. Because after the redirect the url looks like it "should" work. It redirects exactly where I want it, and it shows the ?param_name=Field_name that I want, but the dropdown doesn't populate if I leave it empty, and it doesn't select the right item if I copy the exact same list. I'm jut hoping someone can see what it is I'm missing or if I'm expecting the wrong thing to happen...

I'm sending the page for the second image in my list, Hyla.
http://divinemercyimages.com/uncategorized/new-hyla/

Here is the target of the redirect, for the first size option, this is where the 2nd form is:
http://divinemercyimages.com/8-x-10-canvas-print/?image=Hyla%20Divine%20Mercy%20Image

And here is the code from my redirect file:
http://www.pastie.org/2691018

Screenshot of the Redirect settings on Form 1:
http://divinemercyimages.com/Form-1-Confirmation-redirect.jpg

Screenshot for the Image dropdown field properties on Form 1:
http://divinemercyimages.com/form-1-Image-Properties.jpg

Screenshot for the advanced window on Form 1 / Image field:
http://divinemercyimages.com/form-1-Image-advanced.jpg

Screenshot for the Image dropdown field properties on Form 2:
http://divinemercyimages.com/form-2-Image-Properties.jpg

Screenshot for the advanced window on Form 2 / Image field:
http://divinemercyimages.com/form-2-Image-advanced.jpg

I'm starting to wonder if it isn't the %20's that are coming through on the url?
Anyways, this is all the info on as far as I've gotten. I'm sure it is something silly I'm missing.

Thanks again for the help.