Auto-fill options that appear in a multiselect question

Hello,
I have a multiple select question that i want all option choices that appear to be auto-selected because i want to use the selections in a follow-up repeat group.
e.g.:
Q1 Rotation plan
1 rotation 1
2 rotation 2
3 rotation 3
Q2 products under selected rotation: (I added a choice filter here to filter the choices that appear based on rotations selected at Q1)
1 sample 1
2 sample 2
3 sample 3
4 sample 2(rotation 2)
5 sample 3(rotation 2)
6 sample 1(rotation 2)
7 sample 3(rotation 3)
8 sample 1(rotation 3)
9 sample 2(rotation 3)

I want all options that appear in Q2 to be auto selected because i want to use it in a repeat group.
If i make it read_only, the count-selected function in my repeat group won’t work and getting the choice name in my group too won’t work.

Please help.

Thank you.

Welcome to the community, @wahab_pdm! This post discussed previously should help you solve your issue: