add new coordinate system in solid works

• Define the new coordinate system by a point (in new sketch)
• Select move/copy in the insert

• select the body to move
• select the new point (in step 1)

• in the lower box: select the origin point

• now the new origin defined at the new define point (step1)
• at this step we will add the coordinate system

reference: https://www.youtube.com/watch?v=meoAQiHrKNc&list=PLiDvXogSQ0hdg2hmPSyPWr_N76YkPGHyz

note: 

if we want apply for assembly part. save as part.