# Solid
Create different types of features or parts from different geometry and conditions.
Specific operation steps, take [stretching the boss/base] as an example：
- Draw the geometry (that is, sketch) according to your needs, as shown in the following figure：
- Select the Feature tool：Extrude Boss/Base
.
- Pick sketches and set parameters according to your needs.
- Click the “OK”button to generate the feature, and click the "Cancel" button to cancel.
Tip:
The pick box can only pick elements in the active state（that is, the light blue state, which can be activated with a mouse click）；
When picking a sketch, the mouse can pick its edges or its area；
You can drag the black arrow in the viewport to adjust the parameters；
Place the mouse over the command interface，and
when the sign appears, drag the command interface to any location in the viewport.