The article outlines the steps to select the default SO type for both Immediate and Future views of a presentation.
FOLLOW STEPS BELOW:
1. Select Admin -> Presentations
2. Hover cursor on the presentation you want to change and click Edit
3. Select default Future SO Type
4. Select default Immediate SO Type
5. Click Accept
Reps, Buyers will be able to select an alternate SO type when creating a Sales Order
NB. For a quick tutorial watch below