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How show all colors all items variation in repeating group?

May be anybody know and can help me.
I tried for two days without success to solve this problem.
I will be very grateful for any help!

I 1 have item with different variation colors/decors.
1 item contains list of colors/decors.
Items different by size and another characteristics.
For examle:
Size #1 contains decor1, decor2, decor3…

How i can show in repeating group all variation decors this item?

I’l need show in repeating group all variation this size with all colors/decors list:
Size #1 with decor1
Size #1 with decor2
Size #1 with decor3