The government charge depends on the route chosen, a port-of-entry application or a USCIS Form I-129 petition, and current amounts are published in the USCIS fee schedule. Professional fees, transcripts, translations and travel are separate lines and should be quoted for this profession, not generically.
What to ask before paying
Ask the plant whether it will pay the government charge and the professional fee for the assignment, and get that in writing, since a transfer that looks like an internal posting sometimes leaves the employee paying for a hire. Ask any adviser to itemize: the eligibility review, drafting or reviewing the U.S. letter, preparing the port-of-entry package or the I-129, and handling a request for further evidence if one comes.
A flat quote that silently excludes the last item is the usual surprise. Translation should be limited to the document that carries the qualification; an engineer does not need every course description translated when the transcript and permit establish the credential. Confirm the current government amounts on the USCIS schedule the week of filing rather than relying on a figure from a colleague's earlier case.
Keep family costs, housing deposits and travel on a separate sheet, because none of those affects eligibility.