Multiple REF_ROWS in the same LIST

[Espegg]

I have a key column (USER) related with 4 different tables:
- USER on Activities 1
- USER on Activities 2
- USER on Activities 3
- USER on Activities 4

Now AppSheet has created 4 different REF_ROWS VC:
- REF_ROWS("Activities", "USER on Activities 1")
- REF_ROWS("Activities", "USER on Activities 2")
- REF_ROWS("Activities", "USER on Activities 3")
- REF_ROWS("Activities", "USER on Activities 4")

How could I join all these 4 REF_ROWS tables into a new one and then delete them?