How to link Oracle Query using Excel connection field as filter condition

Hi,

I have TDP 3.8.  I am trying to create a process to run a Oracle query based on a specific field within my Excel connection file and am not sure how to join.

For Example:

Where [oracle field] =[Excel field]

I've attempted to do via a cross connection query but the Oracle query is very complex with many tables, joins and where conditions...  Any guidance is appreciated!  Thanks :-)