Surface modelling

[Manu23]

Hi,

I would like to achieve a not so complex surface in creo but don't get exactly what i want. You can see below what i want to achieve:
Curve 1 and 2 are on the same "xy" plan
4 is on the "xz" plan
3 is on a plan with a 15

 

[Manu23]

You can see here the 2 yellow guidelines created.View attachment 5689

 

[dgs]

Have you tried explicitly connecting them with the control
points are of the BB tool?

 

[design-engine]

try to build off the surface edges as opposed to the curves that create the surface edges