There is no field called Technical Comment in our installation. And you can't update anything on the Test Script tab, unless you are referring to a VAPI-XP test.
So I think you need to clarify the details of what you actually want to do. For example:
- Is Technical Comment a user defined field in a Test Instance?
- Should the field contain the same information in all Test Lab instances of the same Test Plan test?
- Do you want to update it from QTP? Or have you got a corresponding field in Test Plan?