Mark time as billed

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Must be pretty stupid, but I just can't see how to mark time as billed.

I basically want to bring up a list of all current time, and click "mark all as billed", then the running total will just show me new work after that.

Any ideas?
Chris

Sorry, any response for this?
Chris

Found it. Its on one of the three menu options for Time, all labelled "Time"