First, go to options/preferences, then in audio/device, and make sur your Tascam is chosen and the input/output range.
Then right click : insert multiple tracks. Choose 8 tracks and call them "bus", they will be numbered.
Then click on "Sends, receives, and hardware output options" for each of the bus tracks. Change "Audio Hardware Output" in the window to your Tascam individual outs.
Add a new track at the top, call it Tascam, make it a folder and save your folder as a template (right click, save tracks as track template)
Then when you add a new track, go to "Sends, receives and hardware output options" and add new sends.