Dear friend,
Your question is not clear to me since the phrase " Private Ltd Company " simply refers to the constitution of the entity only.
The query pertains to the documents to be maintained by such Private Ltd Co in respect of the persons employed therein only. They differ according to the establishment-specific labor law applicable with reference to the type of the establishment such as factory, shop or establishment etc. Therefore, it is important to disclose the nature of activity of the Company.