# REBUILDOPTIONS System Variable [GstarCAD 2017](Help%20System/GSTARCAD/2017/Index.md) → [System Variables](Help%20System/GSTARCAD/2017/System%20Variables/(System%20Variables).md) → [R](Help%20System/GSTARCAD/2017/System%20Variables/R/(R).md) **Function Description:** The REBUILDOPTIONS system variable is used to control the delete and trim options when rebuilding NURBS surfaces. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 1 | | Range | 0,1,2,3 | **System Variable Value:** **Vuale:** when users use CVREBUILD **0:** do not delete original surfaces and trim area do not apply to new rebuilding objects **1:** delete original surfaces and trim area do not apply to new rebuilding objects **2:** do not delete original surfaces, but trim area applies to new rebuilding objects **3:** delete original surfaces, but trim area applies to new rebuilding objects --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/R/REBUILDOPTIONS%20System%20Variable--e79b3d6e8556.md) · [GstarCAD 2018](../../../2018/System%20Variables/R/REBUILDOPTIONS%20System%20Variable--e79b3d6e8556.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/System%20Variables/R/REBUILDOPTIONS%20System%20Variable--e79b3d6e8556.md) · [GstarCAD 2020](../../../2020/System%20Variables/R/REBUILDOPTIONS%20System%20Variable--e79b3d6e8556.md) · [GstarCAD 2021](Help%20System/GSTARCAD/2021/System%20Variables/R/REBUILDOPTIONS%20System%20Variable--e79b3d6e8556.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/R/REBUILDOPTIONS%20System%20Variable--e79b3d6e8556.md)