How to Change solidworks system to metric?

Hello!
I can change inch-->mm in solidworks temporarily.
but I want change forever
Thank you

3 Answers

1-open new part
2-click on tools(it is on the top,left your screen)
3-click on option
4-go to document properties(which is the beside of the system options
5-click on units
6-change your units as you need then click ok!!!
7-now click on files and then click save as!!!!
8-save as metric unit,just attention that change save type into *prt.*SLD
9-now click save and close the part
10-now open the new part and go to templates and open metric units

open new part
set units to metric in options tab
Save as metric.prtdot
Close part
New parts using metric.prtdot template
Delete old part template if desired

With this new part template you will be starting with metric units

Open new part , then
Tools -> Document Properties
Under left side choose "Units"
Under the Units tab choose MMGS (millimeter,gram,second) or custom units.

Click OK