Arc shape with more than 3 vertices??

Hello guys

I'm here for ask if there is a way to make an arc (shape) with more than 3 vertices, because I made one, converted it to Editable Spline and only shows 3 vertex and I want to make one with 20 vertices, How can I do that?

Thank you

I suppose you use GMAX...

1. Select the spline and choose in the quad menu for Editable Spline.
2. Click on Vertex and go down the menu to Refine.
3. Click on the spline between two vertices and voila you have a new added vertice.

Greetz. José.