Here is how to Freeze your player's CSR to use it to level your players for an upcoming tournament.
This way, player's are separated by a CSR of certain date rather than it changing now until the tournament.
The Frozen CSR will also appear in the tournament as the CSR used during that event.
In your tournament event. Click on Menu > Manage > Event > Event.
Go to the Advanced section in the pencil.
Insert a CSR freeze date.
This will automatically give you a column with the CSR from the date you did the freeze.
During the tournament this is the CSR that will show.
If you want to show it to players, under Events, click on your League, Pencil to edit.
Go to Advance section, Add a Frozen CSR.
Choose your tournament. Add a description, this will be the title of the CSR.
This will be available under players.
You can choose to add this to your stats (Menu > Manage > Statistics/Standing > Stats Model editor.)
Add the column.
You can also put it next to player name by going to Round-Robin, pencil, Public Visibility section.
Field to show next to player name.