Go to: https://mahagst.gov.in/en - then click on login for E-Services -VAT and Allied Acts -Downloads-Forms-Electronic forms -PTRC Form IIIB DOwnload and fill and validate and upload
User id and password available in this path
\\Estibeirohpsvr\blue sky\Profession Tax
While Uploading if Next button not available means return already filed - select Revised option