I have a form that utilizes two contact lists in separate combo boxes to
illustrate projects that multiple people have worked on.

I am trying to make it so that a report will illustrate the associated data
based on these contacts.

The selection will be based on either one contact (from either list) or
both. Whereby on selection, the report will generate the associated data
based on these user names.

How would I go about creating a parameter in the query so that it will limit
the content to reflect either contact list or a combination of the two?

I am a beginner to Access and would greatly appreciate any detailed
responses.