Individually sleeved means each wire is sleeved (covered) separately from the rest like shown here
..A sleeved (covered) cable has all the wires sleeved (covered) together inside one sleeve (cover) as shown here
..Some cables have no sleeving (covering) at all like shown here
..A sleeve is a protective wire/cable cover.
You can use one of the two PCI-E connectors from the cable that's hardwired to the PSU and leave the other connector part hanging doing nothing..Same thing with one of the PCI-E cables that's removeable (Modular) from the PSU..Use only the connector part you need from each cable if you want to, it doesn't matter.
EVGA is saying here
that modular cables from BQ/B2/B3/G2/G3/G5/G+/GM/P2/PQ and T2 units are interchangable with each other..You can Contact EVGA Customer Service
to get cables with just a 6-pin or just an 8-pin PCI-E connector on it (no extra bits hanging off it) or go to CableMod
and get them there.