WAPDA sanction load enhancement

Our workplace has a commercial WAPDA connection with approved sanction load of 34kva on our 50kva transformer.

Now as our electricity requirement has increased, we need to increase our transformer size to 100kva so that our approved sanction also be enhanced.

Please let me know the procedure and regarding the old 50 kva transformer. Will it be WAPDA property or be given to us as we paid for it way back when we got the connection installed.