Hi @Anonymous :
Yes,the key is to modify the UpdateProperty of the data card.
Could you tell me does the "multiselect column" allow mulitple selections?
My data source: 'A'
Q1-Choice(do not allow multiple selections)
Q2-Choice(allow multiple selections)
Step1:Add a edit form
DataSource
A
Item
First(A)
Step2:Use troggle to replace the original combobox control

Step3:
Set the Q1_DataCard1's Update proeprty to:
If(Q2Toggle2.Value,Table({Value:"Yes"}),Table({Value:"No"}))
Set the Q2_DataCard1's Update proeprty to:
If(Q2Toggle2.Value,Table({Value:"Yes"}),Table({Value:"No"}))

Step4:Fix some errors caused by deleting the control according to the error message. (Because it does not affect the function realization, I did not perform this step)

Best Regards,
Bof