well i know most (not all) BIOS's have that option in there where you can specify how much you want to allocate for your video card, so if you wanted it act as, for example, a 8meg card then you specify that in the bios (if available) and then you would obviously be only using 8 outta the 32 megs...
if the option is not available the only thing i can think of that you could try is to try and flash your BIOS and see if it upgrades it including that option, if it doesn't well, your just going to have to go find a second hand low-end video card and disable the onboard...
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