The BOOKS version of MyCorbu does not change anything about how time entries are made. Time is treated as an expense that is charged to Projects to create PROJECT Bookkeeping entries. Whether the project is billable or not does not matter. 

This is an explanation of how the charges are determined.
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What Is The Project Ref
The Project Ref is an optional identifier that you can attach to your Projects to conveniently keep a piece of information available.
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What Are Time Budgets
Time Budgets are the number of hours that you allocate for the work of a Project-Phase. If you use a tool similar to FeeCalqs, then you will have an idea of how many hours each Project-Phase should require.

All Project Time records are found on the 'All Time' page. 
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The Billable Ratio is the ratio of billable hours to non-billable hours. The Ratio is calculated for you. 

The Time Entry Record is the fundamental piece of data collected by architectural firms. 

Filtering time records gives you feedback on the information that your records hold. This is a major benefit that spreadsheets, paper forms and many expensive accounting systems don't offer. ​