With Labeler, you can create your own Label size inside an existing family template.

To do so:

• File/page setup
• Select a Family (ie: Avery Laser)
• Click on New
• Enter the name for your new label (any name you like)
• Make sure that you deselect the "Lock Edits" option and change the parameters you wish to:
  • Number of labels across/down
  • page margins
  • Label size
  • Space between labels