You cannot filter a report as you would like. You will have to do a Find and search for Check Number equal to Mobile.
You could sort the register or all transactions by that column. Maybe that will get you closer. Don't know if you can sort a report by that column. You can export to Excel to manipulate and sort it further.
LOL, I didn't see Mr. Squirrel's post and wondered how you knew my dog's name was Rocky!
I'm just flattered that @volvogirl named her pup after me.
@Mike Mierzwa , Bullwinkle lives in an assisted living in Florida. He's getting on in years, but still keeps the staff busy with his crazy antics. I heard that the staff provides him with an ongoing supply of top hats but no rabbits.