Please clarify how did your Subcontractor get a Licence un the CLRA Act. Did the Principal Employer issue him a Certificate of Engagement in FORM V seperately? If your answer is "yes", your Principal Employer have 2 independent contractors and in his Register of Contractors he would have to include your Subcontractor as well. The total of Licenced Capacity in that case would be 310.
However, if you have issued a seperate Work Order to your Subcontractor and his Labours are working with your work perifery allotted by the PE, they would be considered as your workers (thereby using your Licenced Capacity by the number of workmen engaged) and you would have to shoulder all Statutory Liabilities on account of those workers.
Your Subcontractor, however, can independently quote and be awarded contracts directly by your PE and be your competitor that may kindly be noted please.