Scenario 1:
How to set report format to show 0.00 when the unit price is blank?
Refer the below transaction_
1. Go to Task > Design > click on the field that you want to show 0.00
2. Click on the small arrow [>]
3. Edit the Format String to {0:#,#0.00;;"0.00"}
4. Save and Preview
Scenario 2:
How to display Unit Price column as blank in Report Format for item that do not have Unit Price?
For below transaction:
1. Repeat Step 1 - 2 above
2. Edit the Format String to {0:#,#0.00;;""} > Save
3. Preview the new report format
Thank you :)