How to do a negative cost adjustment

How does one do a negative job cost adjustment? I have a debit memo issued towards a job and not sure how to get it to apply to the job to reduce the job cost?

Job Adjustment under Job Management

I realize that @Vinaykamboj. But in regards to a material adjustment how does that affect the GL?

I believe it gets posted to the Inventory Adjustment GL defined in your Inventory, COS and WIP GL Control Codes.

Vinay Kamboj