How to assign multiple Groups after Payment?

Hi,

If the customer purchases several products in the same order, when the order is paid, the user group selected in each product will be added to the user account.
So, you can create several products in an unpublished category, one per user group. Add to them a characteristic with only one value, and then add them to a main product in the "options" area of the main product. Then, when the main product is purchased, the user group of each option product will be added to the user account of the customer.

Hi,

Well, I already told you what to do in my previous message.
Create an unpublished category. Create a characteristic with one value. Create a second "product 1" in that unpublished category, and assign to it your Group 1. Add to it the characteristic and the corresponding variant.
Then, in your bundle product, you can assign Group 2, and add this second "product 1" in the "options" area.
That way, when the bundle product is purchased, the second "product 1" product will be purchased together and the system will assign both Group 1 and Group 2 to the customer.