ITC when Seller provides sevices on RCM basis

Hello

One of my client is GTA providing services on RCM. While filing 3B there is no GST liability and no ITC set off is taken. however can we accumulate GST paid by company on various revenue and capital expenditures while filing GSTR 3B ? so that it has got reflected in ITC ledger on GST portal over the period. is it allowed to accumulate ITC while providing services which are exempt or on RCM basis ? can we utilize such accumulated ITC balance in future on proportionate basis company provides any taxable service ?
kindly Guide. Thank you