I'm new to hfslip can anyone tell me how to add drivers to my multi os dvd i have a full cd of all the drivers for most pc out but can't get it to work with my build

From the HFSLIP homepage's 'Advanced features' section :

"Using HFEXPERT\DRIVERCAB, you can slipstream your custom driver binaries (in extracted format). These files will be added into DRIVER.CAB. Note that this only works with merging options A, B and C. More information can be found here."

I would recommend using roufneck's DrvComp to filter all unreferenced files
out from the extracted driver packages(the cabbed files needs to be expanded afterwards), and daddydave's DrivercabHelper for automating the inf-edits that this HFSLIP feature requires...