Hi Hidyath,
You can post TDS lump sum for each vendor by FB01/F-43/F-02. The entry will be:
Vendor A/c Cr (Total amount which you want to deduct TDS and also select w.h.tax codes in popup)
Vendor A/c Dr (Put * in amount column and do not select any w.h.tax code)
Then the TDS amount will get credited and also vendor liability also generated.
Regards,
Mukthar