Yes its simple, what makes a minor is the third is flattened so lets take "C" In C major the notes in the chord are C, E, G. So A Minor would have the 3rd flattened therefore the notes in C minor would be C Eb G to make a flattened 7th just add the seventh note of the C scale "B" and flatten it...so C minorb7 = C Eb G Bb Hope thats clear enough
Just had a thought, If you meant can you have say Bbminorb7th or whatever yes do as normal just move the normal minor b7th chord one step toward the nut.
Regards Fenderphil
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