I take it from this that you're referring to the 'physical' manual? If so, grab yourself a copy of the ETC Express Manual. Save it and the next time you need to find an answer you can use the handy 'Search' feature in Adobe Acrobat Reader.
Win98 was still buggy. Granted it wasn't as bad as Win95 (when, if you only had a dozen crashes a day you were doing good) but it could/would crash more than anyone liked. If you can, try upgrading to XP...much more stable than 98/98SE and it's still DOS-based.
Found some things in my Manual that may be of some help.
Deleting a part from a multipart cue
Deleting a part from a multipart cue is the reverse of creating a multipart
cue from a standard cue. When a part is deleted, the channels in the
deleted part do not leave the cue but transfer to part...