hi Giang, did you find the anwer?

I found the answer after trying to calculate by myself.
Subcontractor Lead Time - Manuf. Lead Time = Vendor Lead Time (+ Purchase Security Lead Time) - Days to prepare MO.
For example:
Subcontractor Lead Time (35 days) - Manuf. Lead Time (21 days) = Vendor Lead Time (28 days) (+ Purchase Security Lead Time (3 days)) - Days to prepare MO (17 days).
=> The "Days to prepare MO" is automatically calculated after you have the other lead times.

Thanks Giang, but I don't quite agree with the "-" sign in your first calculation and maybe Lucas can clarify.

You can turn the equation as you want but this was the way I found out the meaning of Days to prepare MO, then I could make a graph for it but I can't share it here.

Hi Ricardo,

It is important to clarify that "Days to Prepare MO" for in-house production (manufacturing app) is available since version 16, however this same feature for subcontracting processes is available as of version 17.

I think you can see some good examples on this talk:
https://www.youtube.com/watch?v=58KIDHlvdM4&t=254s