How to track change control of an Edit under Test Plan in TD ?

[umashankarp]

Lets say we have 14 Design Steps in an existing Test Script under Test Plan tab, the Test Script needs to be edited for what ever reason.
Now, how and where can we track Change Control of an Edit?
And I would also like to know how TD would handle this in 7.2 and 7.6?

Thank you all in advance!