Is there an way to change the prices of the products in one product group based on whether an item from another product group is selected? For example, an 8x10 is $12, but if Package A is ordered an additional 8x10 is $10. The Ala-Carte price (the 8x10 by itself) is $12; the Add-On price (the 8x10 is ordered in addition to Package A) is $10.

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There isn't a way to change the prices in the price list if something else has been purchase. But there is an option in collections/packages for Extra Photo and Extra New Photo. Using those options you can charge a different price when they are purchasing additional products that are in the collection.
https://www.picturespro.com/sytist-manual/articles/creating-collections-packages/

You can also add products using that feature that are not included in the collection:
https://www.picturespro.com/sytist-manual/articles/offer-additional-products-in-collections/

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Thanks Tim! While not ideal, this does seem to accomplish what I was looking for. I really was hoping for an Ala-Carte vs an Add-On option. Add-On products could only be added after a package has been ordered, and would be at a lower price than products in the Ala-Carte options. Same products, but Add-On items would be slightly less cost. Ala-Carte products could be ordered with/without a package. I think you get the drift...

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