Is tax credit available

I hv two cases regarding availment of credit of service tax paid

1) Suppose A manufacturing company pays service tax on the services renders to it  one location which is exempts from excise, wheather a company can take credit of the same to be utilized against other branches.

2) Wheather credit of service tax be available if company pays service tax in relation to a location where only R & D Lab is in operation and no manufacturing will be done in near future also.