GST Change in Constitution_Proprietorship into Partnership Firm

Dear Chartered,

Hope all are doing good,

Let me explain my doubt, in my case there is a conversion of GST proprietorship into partnership firm, i have already taken GST Registration in firm name, and planning to raise a invoice in the FIRM Name and i have not closed the proprietorship GST yet due to some reasons, and now my question is can i still raise the invoice in the firm name even though the proprietorship concern GST is not closed and how can is show stock into new firm and make a sale invoice and also what about ITC available in the proprietorship concern can i use it

Thanks in advance

Please suggest me in this