If I have a part made by using a loft feature and I have two guide curves presented on the picture
The part on the picture is created with the simple loft without using the guide curves. Now i want to use this two guide curves and I edit this loft.
I expand the guide curve section
I am only going to select one guide curve and under the options for the guide curves I will select to next sharp. In the preview I can see that only one edge is being effected with this selection.
If instead of this option I chose global,
In the preview I can see that the whole part is being effected with this selection/
Than I select the second guide curve and because the option is set to global the whole part is effected by it.
We can again change the selection and pick to next sharp
In the preview we can see that only two edges are effected by this option
Click OK and you have your part.