In OfficeRND you can add markups to one-off billing plans.
A markup is a difference between the selling price of a good/service and its cost.
It's usually represented in percentages, therefore making it a ratio.
Note: Markups are only available for one-off billing plans.
There's no option to add markups for recurring billing plans, as recurring billing plans are usually used for memberships, which usually don't have a markup applied to them.
In order to add a markup, you can go to "Billing"->"Plans".
Please, see our article on how to set up a billing plan here.
You'll find the option for markups in the Advanced tab.
Since markups are ratios, the percentage you enter will be added to the base price of the membership in order to form the total cost of the one-off.
When you finalize the creation of the billing plan, you'll be able to assign one-off fees to members and companies. When you do that, the markup will be displayed on a separate row.
The markup field that you're seeing when adding a fee is not going to be editable, as this is a setting that stems directly from the billing plan. If you'd like to change the markup, you have to change the billing plan itself.
Note: Editing a billing plan and changing the markup will not change existing one-off fees that've utilized that billing plan.