The AutoCAD System that generated these would have them defined in a file Called ACAD.LIN or similar - if you can get that file you can import into TBC.
If you want to use these linetypes in your template - create a Line with this Line Type and write it out to VCL and then Import into your template and then delete the line and save the template - the Linetype gets added to your template even the though the data is removed.
Alan