Power query Merge and access column of table

Hi, if I have merge tables as new and then rather than the entire table I only want particular column / s , is there a way ?

so if if start with

 Table.NestedJoin(merge, {"Item"}, MergeStart, {"Item"}, "New", JoinKind.LeftOuter)

i could then ;

 Table.TransformColumns(
                                   Table.NestedJoin(merge, {"Item"}, MergeStart, {"Item"}, "New", JoinKind.LeftOuter), 
                               {"New",each _ [Customer] } )

but is there another way, I've included a couple of different approaches, to show what I was aiming for ,

Queries 'salesitem' salescustomer,

just interested to see if I can get at table columns withing merge. I have a couple of other questions but one at a time.

Richard.

Thanks, at least I can stop trying to do what can't be done.