Do you know if your work radios go through a repeater or direct radio-to-radio (simplex)? If it's simplex, the TX/RX frequency will probably be the same, unless your work uses a split channel (TX on one, RX on the other, with no repeater). If it is simplex, that frequency is your RX and TX frequency. If the radios go through a repeater chances are the frequency you have is the RX frequency. Your work's radio tech should be able to assist you with the TX frequency.
Your post didn't say, you'll need to Motorola software to program your radios. It's fairly expensive software. Again, your work radio tech should be able to assist you. If your work doesn't have a radio tech, you might have luck going to a local commercial radio shop and paying them a fee to reprogram your radios.
I apologize if you already knew some of this, your post was a little vague.
