Editing fstab to mount /data from a different partition

Is it possible to edit the fstab to mount /data, /cache, etc. from a different partition on the 1. internal memory? 2. external SD card? Details: The default partition for /data and /cache is too small for my needs and I can manage to format the (internal) /sdcard in ext4. My question may superficially seem to be like other questions asking for a way to increase the size of /data, but it's not. Here's why: 1. I need to do it *specifically* by editing fstab, which is the usual way of doing the same thing on a GNU/Linux desktop. 2. The other questions don't ask about /cache and other partitions.