Hi @potrek :
I've made a test for your reference:
1\My Source:
ClearCollect(
Table1,
{Column1:Table(
{Collumn3:"Text2a",Column4:"Text"},
{Collumn3:"Text2b",Column4:"Text"}
),
Column2:"TextRow1"
},
{Column1:Table(
{Collumn3:"Text3a",Column4:"Text"},
{Collumn3:"Text3b",Column4:"Text"},
{Collumn3:"Text3C",Column4:"Text"}
),
Column2:"TextRow2"
}
)


2\Please try this code:
ShowColumns(Ungroup(Table1,"Column1"),"Collumn3","Column2")
The Result:

Best Regards,
Bof