It's a long process but with owner mode no longer available in Franchise I figured theses steps might help someone else.
Step 1:
Select the team you want to trade the head coach to for example if you want to put
Andy Reed on the Rams select the Chiefs.
Step 2:
Don’t select actual real coach, instead select a coach type. (This custom coach will replace Andy Reed)
Step 3
After the custom coach is created scroll over to options/user teams and create a new coach for the team you want to replace Andy Reed on. In this case select the Rams.
Step 4
Once you select the Rams create a new custom coach to replace “Sean McVay”
Step 5
After creating a custom coach for the rams head back to options users teams. You will see two custom coaches for the Chiefs and the Rams. One should say commissioner. Select the rams created coach and switch back to that user. Once you are in the Rams profile. Go back to User Settings and select Retire. This will retire the custom coach you created for the Rams.
Step 6
Create a new character and this time select the Rams and choose a real head coach. And Andy Reed will magically be the head coach for the Rams.
Step 7
If you want Sean McVay to appear on the chiefs. Repeat the process of selecting the chiefs profile, retire from the league, create a new character and select a real head coach. And Sean McVay will be the head coach of the chiefs.
This is a 7 step process workaround as there is no fire coach option in Franchise mode.
Step 1:
Select the team you want to trade the head coach to for example if you want to put
Andy Reed on the Rams select the Chiefs.
Step 2:
Don’t select actual real coach, instead select a coach type. (This custom coach will replace Andy Reed)
Step 3
After the custom coach is created scroll over to options/user teams and create a new coach for the team you want to replace Andy Reed on. In this case select the Rams.
Step 4
Once you select the Rams create a new custom coach to replace “Sean McVay”
Step 5
After creating a custom coach for the rams head back to options users teams. You will see two custom coaches for the Chiefs and the Rams. One should say commissioner. Select the rams created coach and switch back to that user. Once you are in the Rams profile. Go back to User Settings and select Retire. This will retire the custom coach you created for the Rams.
Step 6
Create a new character and this time select the Rams and choose a real head coach. And Andy Reed will magically be the head coach for the Rams.
Step 7
If you want Sean McVay to appear on the chiefs. Repeat the process of selecting the chiefs profile, retire from the league, create a new character and select a real head coach. And Sean McVay will be the head coach of the chiefs.
This is a 7 step process workaround as there is no fire coach option in Franchise mode.