How to keep time stamp unchanged if any changes in the data for the another cell?

[azar3]

What is the way to keep the time stamp static for inserting row in H , for any changes in cell G , and also for C if B changes , when inserting a row Please open the link below so that the explanation be easier for us to review it
link : https://docs.google.com/spreadsheets/d/19XezZuolC-elWUgKOiRTCoFwtjz5SEwLyZX2RyCY0FU/edit?usp=sharing

 

[Joe4]

Duplicate: STATIC TIME STAMP FOR ANY CHANGES IN FILLED CELL

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