Hi Bill.
Welcome to WTP forums.
Segmenting can be fun and rewarding. Lloyd's software simplies the planning process for designing a vessel and developing the cut list.
Take a look at the videos to learn about the software. Ask questions, there are members here who can help.
WTP - give you full control over each ring.
STP - is rules based and currently limits what ring you can modify.
If you have not purchased the software you can try the programs for 30 days for free.