Knife tool
The Knife tool 
allows you to slice contours (multi source editing works as well).
Click the icon in the toolbar, or use the short cuts below.
| short cut | description |
|---|---|
| 3 | Select tool |
Actions
| action | description |
|---|---|
| click + drag | Show intersection points |
| click + drag + release | Slice |
| ⇧ + click + drag | Show intersection points with angle constrained to multiples of 45°. |
| ⇧ + click + drag + release | Slice with angle constrained to multiples of 45°. |