It sounds like you aren't using the 'Call from Screen' section of CSDS. If this is the case, from the main menu, select 'Dance | Empty Dance'. This will quickly place you in the 'Call from Screen' section. From this screen you have access to the music player and cue sheets.

Also, you might try converting some of your Word cuesheets to RTF format (in word, just use 'Save As' and select 'Rich Text Format'). These files load quicker in CSDS, and CSDS has a built in viewer.

I looked into the 'Split File' function for MS Word Documents when CSDS is in 'Call from Screen' mode.

In 'Call from Screen', if you bring the Word document to the primary window, in the upper right-hand corner of the frame, immediately above the vertical scroll bar's up-arrow, there is a very small horizontal button. This is the 'File Splitter'. Grab it, and drag it downward to split your document.