The Pro-1000 is completely modular.
38 Special takes Shellplate #1, the small primer punch and chute, the large case feeder, small case feed slider and straight "Z"-bar.
9mm Luger takes Shellplate #19, the small primer punch and chute, the small case feeder, small case feed slider, and straight "Z"-bar.
40 S&W takes Shellplate #19, the small primer punch and chute, the large case feeder, small case feed slider and bent "Z"-bar.
45 Auto takes Shellplate #2, the large primer punch and chute, the large casefeeder, large case feed slider and bent "Z"-bar.
To convert your press to load 40 S&W and 45 Auto you will need to buy:
#2 Shellholder
#19 Shellholder
Large Case Feed Kit
Large Primer punch and slide chute
Bent "Z"-bar
Dies of the caliber required
I personally would advise buying a die turret for each caliber to make changeover quick and simple so you don't need to adjust your dies any time you change calibers.
I would also advise that instead of buying just the primer parts you need, that you buy the Primer Parts Kit #90660 in a red translucent box which has a complete set of primer parts for large and small primer applications plus another primer tray. What you are going to load has a lot of small primer and the chutes can get damaged and the whole parts kit costs about what buying just the parts you need already costs.
When I had only one shellplate carrier, a conversion took me about 10 minutes or so to get it changed over and then re-adjust the shellplate timing, change and check the powder disk, and be ready to load.
I wound up buying complete shellplate carrier assemblies for each major caliber along with case feeder parts I leave ready to switch. I also got extra Auto_Disk powder measures that I leave already mounted on the die turret for that caliber. All I have to do is drop in the carrier and die turret, add powder and primers, run a few dummies to check powder drop and OAL and crimp, and away I go.