Multiple handling.meta files?

Here’s the deal: My Ingot and other cars have either AWD or more power. I want to add AWD to the Glendale (W124 4Matic anyone?) and Warrener, but it seems they aren’t in the main handling.meta file?

Question is: can I use multiple .meta files in the same citizen/common folder?

No, you can only use 1.

just copy the full handling lines of the car (dont forget one) then add it in your handling.meta file. (ideally above AKUMA lines)
it also work for bikes. I have handling working for all bikes included Cunning Stunts bikes with this method.
Same thing with your vehicle.ide also work.