On large assemblies I like to create one drawing file with multiple sheets.  If you get more sheets than will fit across the bottom it gets challenging to get to the sheet you want.  The left hand side gets to be a mess with the addition of  BOM, and Cut lists and a constantly expanding tree that I am collapsing all on constantly.  I created a macro to rename all my sheets to the file name of the part to help find what I am looking for, but I am sure there are better methods.  How do you guys do it?  Multiple drawing files for each sub assembly?  Is there another way to see the drawing sheets other than the list at the bottom, or the list of the left?