service tax set off against cenvat credit availed on CG

We are one of the manufacturers of MS Angles, Channels, TMT bars, Transmission Towers, Communication Towers and Service providers for Erection & commissioning, Civil Construction for Commercial Buildings etc. We are Turnkey Solution Providers to transmission and communication industries

^{The services, which we are providing, are indirectly related to our supplies of transmission and communication towers.}

^{We have huge credit availed on inputs and capital goods related to manufacture of excisable goods. The inputs and capital goods are not directly related to the output service.}

^{Shall we utilize the above credit towards set off against payment of Service Tax?}

^{Please clarify, as it involves huge amount of service tax payment.}