how to show/hide a whole table in query based on user input

[train2]

I can't find a similar thread to answer this question.

I have users selecting on a form, to include fields in a query. The data is from the same table that I've included three times in the query design, and I'd want them to make up to 3 choices.

I've got it working fine for when they make 3 choices. But I need a way to either hide the repeated table in the query, or to hide the fields for that table should they make fewer choices.

Any ideas?
train2

 

[train2]

This is the way I'm just trying....

I'm basically writing in VB to create the SQL syntax based on whether fields are blank / or not.

Is this logical?