Is your datasheet stored as an attachment to your test case in Test Plan..??
If yes then the workaround is to download it, modify the same and upload to the same path(You got to delete the older one there else it will create a second instance of the same). This thing can be accomplished using OTA( QC API).
I am sure you will find lots of data if you search the forum for the same.
I had posted a code to retrieve the list of test scripts in TestPlan under a folder two days back, hope that will serve as guide to your issue.
Nope. These are QTP tests/scripts stored in Test Plan. Instead of connecting and modifying data sheets (there are many columns in some cases and data is sometime similar for test cases) in these scripts I want to just enter it in one local location (can be a script or file) and run a script which will update the all the script data sheets in the QC Test Plan.
I saw your post couple of days back. I am able to find the script names etc but I want to access their data sheets.