The Celltimes.txt function outputs celltimes (or optionally, just program or chapter times) in a textbox which can be saved for later input to a muxing or encoding program. You have a choice of output formats: frames, hh:mm:ss:ff (standard time plus frames), or audio duration (standard time but frames expressed in 1/1000ths of a second). You can even make an MLS bookmark file for input to Womble Multimedia MPEG Wizard.
If you are adding several clips together, use the offset value in frames for the latter clips (i.e. the 1st clip ended at frame 10,000 so enter 10,000 as the offset for the 2nd clip).