Amending changes in petition

The amendment to be carried out in the original petition by inserting the contents permitted by court to be amended without striking out the original contents.

The amended contents are to be endorsed in red ink in the original petition.

Subsequently an aemded petition to be filed before the concerned court.

You may discuss all such practical issues with your advocate and proceed 

Simply file amended petition in court. 

You have stated, inter alia, that,

"...........An amendment having been allowed how to exactly carry out amendments sought and allowed in the respective document, if the changes are substantial. Do I need to submit the amended document with original content to be removed striked out in red and inserting in red approved changes and submit as amended document or how to carry out amendment..."

What is the case?

What is required / allowed to be amended?

You have mentioned an amendment having been allowed and later on stated "how to carry out amendments sought and allowed in the respective document" these are the two contradictory statements.

Can you seek / allowed amendment in a document, if changes are substantial ?

Prima facie it is a hypothetical and academic case.

What is the opinion and advise of the lawyer who have managed to get the desired amendment allowed by concerned court.

No opinion can be formed and obliged on the basis of presumption.