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Can we create help text while mouse hover the label of field

Accepted answer

You can set the value to be displayed when hovering a label by modifying the "Description" value for the presentation.
Comments

It would be greatfull if you show us the steps in eclipse client ?

General information about customizing the work item editor via the Eclipse client can be found here:
https://jazz.net/help-dev/clm/index.jsp?re=1&topic=/com.ibm.team.workitem.doc/topics/t_customize_work_item_editor.html&scope=null
You'll want to:
1. Follow step 1 from the above linked document
2. Locate the presentation where you want help text and click Edit
3. Fill in the description field and save the changes

thank you very much :)