How to work as a partner in a properietory firm

you need to setup a partnership firm with the same name through partnership deed or work as an associate of the proprietorship firm.

But you would be required to open a separate bank account for the same for signing auhority purpose.

Regards,

Advocate Rohit Dalmia

9324538481

Mumbai

Advocate Rohit is rightly advise, nothing left to add

In your case, it is not partnership, its simple a working arrangement for a particular project. A firm cannot have different partners for different jobs.

The Proprietorship Firm is a legal person in itself. It can sign agreements, open accounts, buy properties in its name etc. So in your case, the proprietorship firm has to enter a working arrangement with Y(who may be individual or a Firm) clearly indicating the roles and responsibilities of both the parties and specific mention that this relationship is only for this and this project or any future future project if decided specifically. The proprietor of PF will sign the agreement on behalf of the firm and the other party will sign as per its status-individual or firm. A separate bank account is to be opened in the name of the Prop.Firm  with Mr.Y as joint holder. The account can either be operated E or S Basis or Joint basis.

Careful drafting of the words is of utmost importance in such cases. 

One firm cant have two PAN,

Its possible to have a partnership for single project but this will be a separate firm but can have the same name or you can go for a consortium mode.