I started off by securing a long piece of cable close to the outlet I will be tapping into, and then threading the cable behind the water heater, through the back of one of the cabinets, and out into the area behind the bench.
Next I cut some pieces of conduit into appropriate lengths, threaded them over the cable, and secured the conduit with some clamps. Here's the clamp inside the cabinet.
I will be putting several outlets at the left side of the bench where the cable emerges from the cabinet.
I previously installed outlets at the front of one of my benches, and they were so useful I decided this would be a great opportunity to put in a couple more.
Once I decided on the location, I drilled out the front edge of the bench (a 2x4) with a hole saw.
After enlarging the opening with a chisel, I threaded the armored cable through and connected the extra outlet. I always use armored cable under the bench, just in case I happen to drill through the bench top - not very likely as it's made of 2x6 boards, but it's always better to take too many precautions where safety is concerned.
Next I extended the cable/conduit to the pre-existing outlets at the rear of each bench.
These outlets are fed by cable exiting from the outlet bank at the left side of the bench - essentially what I have is just a long extension lead with LOTS of additional outlets....or it will be when I get it finished...