want to take over one pvt.ltd company

You have not specified how to want to take over. By purchase method or by equity method.

You could start by appointing a merchant banker. An escrow account has to be opened and the cash for the purchase of the securities needs to be deposited. It could also be in the form of securities with appropriate margin. Following that, a public announcement is required to made disclosing your intention to take over the company's shares. The shares could be bought either by an open offer. The announcement should include information like- identity of the acquirer, purpose of acquisition, change in control of the target company. The announcement should include a specified date along with the name of the shareholders to whom the offer letter would be sent. Within 14 days of the public announcement, a letter of offer has to be filed with SEBI along with a filing fee, due diligence certificate and registration details.

This is a Private Limited Company.Get shares of the Private Limited valued from the Registered Valuer.Inter in to Share Purchase Agreement with majority of share holders of the Comapny get share Transferred in the name of the Buyer at  the Board meeting of the Private Limited Company after following some procedures for share transfer.After Transfer of all or majority of shares in the name of the the Buyer take control of the Comany.

The Buyer is a Company registered under the Indian Companies Act  1956 or 2013 it internal procedures has to be followed.