good, very very good.

So if i need to change tee type i only change the SKEY in TEE section.
(example: i need a threaded thee, i will change SKEY TEBW with SKEY TESW.

If i need an olet, i have to impement the FIVE changes you made to the second example:
1) replace TEE with PIPe at the begginning
2)add OLET after the 2 coordinates rows
3) below olet: CENTRE-POINT row: add at the end of the row the same diameter of last pipe (see 2 row before)
4)add BW at the end of the 4 coordinate rows
5)change SKEY to BTWB

if i need to insert a thread olet:
i change 5) with THSC. in 4) i leave BW because is the weld between header and olet.

great!

question: if i have maaaany olet, many weldolts and many sockolet, how can i understand what to made sockolet and what weldolet? only by coordinates? very hard and time consuming.... for example, is there a way to make appear node numbers at olets inside the PCF?