The steps are as follows.

Press”ADVANCED FUNCTION”button,then choose “Park Work”
Enter”SelectWorkFile”interface.For example,we choose “Internal File”
Choose the file we need For example,we choose “SONIC.NC”
Input the start source number of working
For example,we start from NO.210
Input the stop source number of working
For example,we end in NO.862
Press”REF/OK”button,it will continue to work.
The video is as follow.