See Split Operation under the NC Operations Manager Toolbar.
Split Operation At Every Tool Change
Every tool change encountered in the operation will become a separate operation. A tool change is the sequence of record(s) which begin with the coordinate system information record and end with the tool change record.
Split Operation At Tool Change If Different Tool Number
A tool change sequence will not become a separate operation (as above) if the tool number is the same as the tool number in previous operation.
If the operation cannot be split by the command, an error message is displayed. An operation will not be split if the result would be the same single operation as the original. This may occur when the operation selected has only one tool change sequence, or the tool numbers are all the same.