TDS on profesional service

Please guide me on following matter regading TDS
Our co. Appoint some part time employee for graphic designong work on freelancing basis.
So, we make their payment under the head of Professional service.

Is TDS applicable in the above case ? If yes then how? Because how we calculate the payment amount for max. Limit for single bill & p/a . Because there are six such type of freelacer doing professional service and there payment amount is different from each other.