Holy cow, I think I figgered it out.

In the Win96 Help file there is this nasty formula when discussing Extended Trunking Tables: Voice Frequency = Base + [(channel – Offset) x Step]

This same formula is used in this most excellent but mind-numbing Wiki:

http://wiki.radioreference.com/index.php/Determining_Base/Step/Offset_for_VHF/UHF_Motorola_Systems
It seems that Lo and Hi are pertaining to the "channel numbers" in a system. The Wiki describes that 0-379 are dedicated for 'receive' and '380 -759' are for transmit. So it starts with 380 and can't go past 759, IMHO. Also something about the channels cannot overlap

I created a spreadsheet for the formula: Base + Channel + Offset = Frequency.

480.5000 + Some Number + .0125 = 482.0875 (your first channel)

I started with 380 and I worked up from there.

I found that

480.5000 + 507 + .0125 = 482.0875 (first channel)

through eventually where

480.5000 + 681 + .0125 = 484.2625 (last channel)

I think that solves Glendale, Monetbello, & Oat Mountain.

For Burbank I programmed in

470.0125 + Some Number + .0125 = 470.0625 (first channel)

and right away I found that

470.0125 + 384 + .0125 = 470.0625 (first channel)

through

470.0125 + 402 + .0125 = 470.2875 (last channel)

So you'd create a Customized Fleet Map as follows:

Lo: 384 || Hi: 402 || Base 470.0125 || Offset 380 || Step 12.5

Lo: 507 || Hi: 681 || Base 480.5000 || Offset 380 || Step 12.5

Again, w/o Trunker S/W, this is just a good guess. And you are on your own for Pomona.

HTH, Mike