A postponement of the same assignment is usually manageable, but a change in the work, the location or the employing entity alters the facts the petition was approved on and should be reviewed before he travels or continues.
Handling the change
Distinguish three situations. First, the affiliate's shop is not ready and the start slips by some weeks: the approved petition and its validity dates still describe the same job, so the company should confirm the new travel date fits inside the validity period and keep the correspondence explaining the delay. Second, the affiliate decides the technician should also spend time at a customer's plant: that is offsite work, and the company must confirm it controls his work there and that he is not being supplied as labour, which may require an amended petition.
Third, the affiliate asks him to stay and run the inspection department: that is a different role, potentially managerial, and continuing under the L-1B approval would mean working outside the basis of the status. In every case the record of what changed and when should be kept, because the extension petition will be read against the original one. The five-year L-1B limit continues to run from the first admission regardless of delays.