May i know how to clear the previous content ...

[dev_bc]

May i know how to clear the previous content in the spreadsheet if the Valid_If is invalid?

Thank you

[Aleksi_Alkio]

Would you please describe your case little more. I couldn’t understand your question.

[dev_bc]

Example: If the condition for A data not equal to NO. I would like the app delete the B data after sync.

[Aleksi_Alkio]

You would need to create an action which won’t delete the value, but it can write a blank value into that field. You need to trigger that action when the form is saved. It’s an option called “Event actions” in your form view.