Hi All, Is it possible to add the line level approver , we have setup where I would like to send the bill for approval to department head and there is possibility of multiple department in single bill ?

Only if you're trying to do this on the item sublist. The expense sublist is not available in workflow, which I'm assuming is what you actually want. And line level changes in workflows in general are still pretty limited. You could accomplish this via saved searches as conditions for what approvers are needed and then populating those approvers at the header level. If you absolutely have to record the specific approver at the line level, you're probably going to have to script it either in its entirety or by adding a workflow action script.

got it