Changing data for rows NOT selected in a read-only grid

Hi team

I'd greatly appreciate some assistance with this issue please

Table setup:

• Table 1 - CMC
  • case type 1 (Onboarding Case)
  • fields
    • onboarding case id
    • onboarding case parent id
    • milestone id

• Table 1 - CMC
  
  • case type 2 (Onboarding Subcase)
  • fields
    • onboarding subcase id
    • milestone id

• Table 2 - Onboarding Case
  • id
  • case id = CMC onboarding case parent id

•  Table 3 - Onboarding Subcase
  • id
  • case Id = CMC onboarding case id

Note:

• Each onboarding case can have multiple subcases.
• Each subcase represents a product to assess.

The flow goes roughly like this:

show list of products -----> select one product -------> update selected product milestone -------> start assessment process

This part works fine but I need to find a way to update all the unselected rows so their milestone value can be changed.

Any ideas?

Blessings

Stephen