I figured out the checkbox visible, not visible conundrum, but I need to format the critera for the parameter query.

I have a few pre-baked queries that are set based on input from a form. I'd like to add functionality that allows multiple criterion to be provided by the form.

For example, there is one combobox that allows a user to select the critera for a form. The query is set up like this:
Criteria: [Forms]![SpeciesByFieldOffice].[Form]![cboFieldOffice]



I'd like to have a checkbox that makes another combobox visible with the same values if the user wants to add another value. For example:

Criteria: [Forms]![SpeciesByOffice].[Form]![cboOffice] & [Forms]![SpeciesByOffice].[Form]![cboOffice2]

How do I format the criteria to accept input from multiple form inputs?

Solution: Use the 'Or:' fields under the 'Criteria:' field in the query builder. I was afraid this would take null values and return everything from the table but it doesn't.

Any Suggestions?

Thanks