KSS Web Access - Grouping Filter Items?

Is there a way to group filter items in KSS Web Access while creating a filter? For example, I'd like to create a filter that would include our 3 domain controllers (DC1 OR DC2 OR DC3) AND contain a message "A user account was created." I couldn't find a way to do it in the WA interface.

I thought of maybe exporting the filter, changing it through Notepad, then Import it back to KSS Web Access, but didn't know the script commands to group the 3 DCs together.

Anyone know how this can be done? Thanks!