How to give Complimentary (No charge) on Orders in eZee Optimus?

In eZee Optimus POS system to apply Complimentary (No charge) on any Order first it's require to create discount with 100% and provide privileges to user then only that user can apply Complimentary or NC order. Follow below mention steps.

1.) Switch to back and add NC or Complimentary discount from Discount tab by referring below screenshot. 

2.) Once Discount added using above screenshot provide privileges to user and then system allow you to apply complimentary or NC as it's shown on below mention screenshot.

Note : Once you apply 100% discount or Complimentary or NC system will not generate receipt for that type of order. You can view that order in report.