Franchise and sole proprietorship firm

HELLO FRIENDS, MY CLIENT RUNS AN PROPRITORSHIP FIRM HAVING ITS REGISTERED BRAND, NOW HE WANTS TO GIVE FRANCHISES OF HIS BRAND IN DIFFERENT CITIES.

PLS. TELL ME WHETHER AN PROPRIETORSHIP FIRM CAN GIVE FRANCHISES OR IT SHOULD BE CONVERTED TO PARTNERSHIP FIRM OR PVT. LTD. CO.

THANKS.