There are a lot of court verdicts that state that all employees working in connection with the operations of a factory should be considered together for coverage of any labor law, even if they are working in separate locations. Similarly, having separate licenses and maintaining separate financial statements, i.e., Profit & Loss Account and Balance Sheet, will not establish the establishments as separate entities for labor law coverage. What is crucial here is the financial interdependence among the units. For further reference, you can review a Supreme Court Verdict attached.
You may also refer to L N Gadodia & Sons & Anr Vs Regional Provident Fund Commissioner [(SC) 2011 LLR 1124], a case regarding the consolidation of establishments for EPF coverage.