Advance tds payment to avoid multiple returns

Hello,

I run a business (LLP) and I have a vendor who supplies software services for my work. Since the total amount to be paid per annum is already fixed to the vendor and the payment may be scattered over many months/quarters.  Although the total TDS amount is less but I have to spend more for TDS returns because of 4 returns.

I am looking for a solution where I can make one TDS returns.

Also I would like to know, is it mandatory only a CA should return the TDS? or can I also do online? (please note that I have a PAN and TAN registered for my LLP).

Regards,

Susan