I have an application where eight main products are offered.

Each product has a varying number of add-ons that can be ordered. The add-ons add to the base price of the main product.

How do I enter this into Smith Cart? The data model has variants but I don't want to create a variant for every combination of add-ons. Is this combinatorial solution the only way to provide all, some or none of the add-ons to the user? Should I be using some other feature of the data model like the product matrix or conditional variants?

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Answer: Make each add-on a variant group and put a single add-on variant in each group. That way checked boxes add the price adjustment for each group (hence each variant in that group) to the total.