"Add list" to a list field only those values ADDED by user on a multidropdown

[cheskiefisch]

I have a multidropdown with its default value reflecting a list field called “A” in the database, when a user selects additional items to the dropdown in addition to what was there before, i want to save those additional selected items to a separate list field called “B”.

So i have a “modify a thing” action with the field “B”, what do i write?

add list multidropdowns value and?..

[romanmg]

B add list (or set list) multidropdown’s value :filtered, where the filter is unique ID isn’t in list A’s unique ID.

You take the multidropdown list and filter out list A’s items.

[cheskiefisch]

@romanmg

@romanmg

where the filter is unique ID isn’t in list A’s unique ID.

Thanks roman

How would you express that in bubble language? (After :filtered)

[romanmg]

See screenshot for the same type of filter on a repeating group source. Instead of search for users :filtered, yours would be “multi-dropdown’s value :filtered”