Removing Data field content from a data record without deleting whole Datatype

Hello dear Bubble community,

Thank you in advance for your help!
I have the following situation I have a Datatype A which includes as a field Datatype B.

In a repeating group I display datatype A including the field that is datatype B. I now want to have a button to delete the entry In data type A in the field for datatype B. However when I hook it up to the workflow the button will delete the whole entry in Datatype B but I just want the field in Datatype A cleared and empty. How can I build this?

Action:
Make changes to thing

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