blend

[ptc-4023856]

what is blend

[Constantin]

Connecting at least two sections (or curves).
The result can be a surface, solid or cut. Depending on the feature used boundary conditions on the first and last section can be created towards the adjacent surfaces...

But then again, you could have just searched for it in the help center...

[KevinBradberry]

There is also Swept Blend. It will let you sweep along a path and choose differing sections along the way.

Here in PlanetPTC seach for blend or swept blend or boundary blend and you'll find some examples, especially in the videos section.