Provincial Tax in DHA , Lahore,

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Asslamulaikum

I have recently bought a home in DHA Phase I , Lahore , Now as i went there to get my Allotment letter i was asked first to pay some provincial tax in the form of 120'000 "stamp papers" kindly please CMY or any person guide me how to complete this process to get these stamp paper and submit @ DHA office to receive my allotment letter , please guide me step by step.

Best regards