Omit Subset changes the current selection of records. The current selection of records is reduced to the records not in the "User Set" (highlighted records). Any existing Sort will be lost when using this command.
A new current selection can be created directly from the Output layout by highlighting records and defining the highlighted records as the new current selection.
Create a User Set:
1. Highlight one or more records.
1. Click on a record.
2. Hold the "Shift" key down and click on an other record to highlight the records and add them to the User Set (highlighted records).
3. Hold the "Command"-"Control" keys down, click on a record to make it part of the User Set or release it from the User Set.
2. Actions menu > Show Subset
The User Set becomes the current selection
Note: Actions menu > Actions menu > creates a new current selection from all the records that are not highlighted. It is the opposite of "Show Subset".