If your company is Controlling Subcontract Labor then it is already doing the process and is not ignoring it

.
I suggest you analyze the work of controlling subcontract labor starting with (and returning to) setting (and resetting) the criteria for selecting and reselecting subcontract labor.
You would be wise
not to invent a procedure especially for BSi

.
Analyze the process and document its procedure instead by taking the following steps as part of developing your management system:
1. Define the objective of the process (eg: watertight tanks built on-time to spec)
2. Identify who is involved in the process (eg: suppliers, supervisors, workers and customers)
3. Specify who sets the labor selection criteria
4. Specify how labor is recruited (
is not should be)
5. Specify how labor is trained (again focus on reality)
6. Specify how labor is briefed on the requirements
7. Specify how the work area is made safe before starting site work
8. Specify who monitors and corrects the work
9. Specify the instructions used for welding and testing
10. Specify how the labor is paid (may refer to other forms)
11. Specify who evaluates the adequacy of selection criteria
12. Return to 3. above
13. Specify who evaluates the effectiveness of the procedure
Obtain as-is review comments and correct the procedure. Require non-acceptance of the as-is procedure to result in process changes within two weeks. Update procedure to reflect the new as-is. Have the senior manager responsibile explain and issue the procedure for use and improvement by everyone involved.
Managers and supervisors should be prepared to show your auditors how effective it is and what is being done to improve its effectiveness.
You can do this if you respect reality

and avoid the creation of a fictional procedure.