sorry for the question that probably has been asked - and answered - frequently, but I found no adequate topic in here, at least not in the sticky section.
Q: What is easiest way to compose your own stage race from stages from different pre-defined races? I don't mean creating your own stages. Just building up your own race like this:
prologue from Tour de France
2nd stage from Giro
7th stage from Vuelta
3rd stage from Dauphine
TT from Giro
Well, you need to add the race to the DB like explained in one of the sticky threads. The only thing that changes is the stages - instead of placing the stages of the specific race, you'll to have stage 1 as TdF prologue, stage 2 being the 2nd stage from the Giro, etc. You can use .cdx files (you can edit them with the notepad) to link already existing stages to your race (either that or copy all the stages and rename them, but that's going to take much more MBs).
Example:
Let's say the gene_sz_filename of your race is "newrace". You want the first stage of your race to be the TdF prologue. After adding both race/stages to the DB, you copy one of the existing .cdx files and rename it to "newrace_01_2012.cdx". The file itself would look like this:
<root>
<fallback>top_tdf_01_2012</fallback>
<stagename>Liège – Liège</stagename>
<regionid>401</regionid>
</root>
Fallback: stage you'll use.
Stagename: well.. stage name
Region ID: ID of the region of that stage (see STA_region, or check the stage info itself in the Stage Viewer/Editor - although you'll still need to check STA_region to see which ID does that region correspond to).