Merger of Pvt Ltd Co

We are group of Private Limited companies and this query is related to 2 Pvt Ltd companies which having 1.5 Cr and 50 Lakhs paid up capital.We want to close the operations of 50L Pvt Ltd Co which is having 70L value of machineries.For that purpose just we purchase machineries from that co by 1.5 Cr Co and keep it unoperational or Merge 50L co with 1.5Cr Pvt Ltd co.which is beneficial in terms IT,Gst and ROC.Please guide in this regard Experts.

Thanks in Advance