?Can anyone tell me how to make a Union Query. I am not very advanced in
Access. I need to make a combo box that allows the user to select all or
just one item. The response back suggested I make a union query to do this.

Currently my combo box row source is from a table called "Project".
The response from the community told me to do the following but I am lost.
Thanks in advance for your help!

Response:
Use a Union query as the row source for your combo box:

Select "All"
From SomeTable
UNION
Select SomeField
From SomeTable;