Hi Vaibhav,
First, your question is not so clear:
You write that you are trying to add a custom infotype, which manages the job's description. Do you mean Infotype 1002? If so - this is not a custom Infotype - it's a standard one.
Second,if you want to enhance the infoset, this is done by SQ01:
- Choose the relevant infoset by SQ01 and press the Change button
- Choose "Edit" menu --> choose the "Change Info-Type Selection" entry
- In the Popup window which appears, mark the checkbox for the relevant infotype
Regards,
Liran