You can define time codes that represent a service or activity performed on a task. Billing amounts are computed based on the number of hours of approved time and the time code's bill rate.

The rates are defined at the Company level and can be overridden at every project level. Only time-entries and expenses marked as 'Billable' when approving are accounted towards the task or project's Bill Amount.
As an example, for the wall painting project, when you decide to opt for the hourly time code based billing model, you decide on a price for this service and arrive at a billable amount.

Once you mark a Project time code as Non-Project time code, you CANNOT convert it back to a project code.

Editing a Time Code 'Name' – If you edit the name of the time code, all time entries (new and existing) will reflect the new name.
Costable – If you mark the time code as costable, all new time entries will reflect it, but the old ones will not.
Deleting a Time Code – All time entries in "saved" and "rejected" states will be cleared of that time code and moved to the 'Default' time code.

Time code Billing Rates
If the company billing model is Time-code based, the bill amounts are computed from the rates defined against the Time codes. Rates defined at a company level can be overridden at the project level.
When the rate on a Time code is changed, it is applied to all new and saved time entries. Any time entries that are in pending approval, approved, or invoiced are not changed.

Once you mark a Project time code as Non-Project time code, you CANNOT convert it back to a project code.

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