How to create change document which are not available in sap standard objec

Hi Workflow Gurus,

I am Jnana Ranjan currently we are Implement sap campus management for one of the university client. Here i have implement campus management student admission process workflow.

Here i have searching change document object, but there are no such type of object available sothat i am unable to linkage event . Can any one help me how to create Change Document Object and what are the step . If i created this object then after i am able to create event linkage for admission process workflow.

Please help me and guid me for this issue.

Advance thanks you.

Regards,

Jnana