To Trim a Surface
1. Click Style > Surface Trim. The Surface Trim tab opens.
2. Click the Quilts collector, or right-click and choose Quilt Collector, and select one or more quilts to trim.
3. Click the Trimming curves collector, or right-click and choose Curve Collector, and select the curves that you want to use to trim the quilt.
* 
The curves must lie on the selected quilts.
4. Click the Trimmed portions collector or right-click and choose Delete Collector, and select the trimmed pieces to delete.
* 
Do not select all the trimmed pieces for deletion.
5. Click OK.