You can create up to five Tiller spreadsheets with your subscription. If you've reached that limit and want to create a new spreadsheet or just have redundant or duplicate sheets linked you'll need to unlink one of your sheets.
Log in to the Console at https://my.tiller.com/
Click on the sheet's name on the left navigation menu to expand the configuration details for the sheet
Click the gear icon at the top right, then select Unlink
Click the "Unlink this sheet" button under "General Settings"
Confirm you want to unlink the sheet in the dialogue box that appears
How to find unlinked sheets
You can find Google Sheets that you've unlinked in your Google Drive at https://drive.google.com
The location of unlinked Microsoft Excel workbooks depends on whether you stored the file on OneDrive or locally. If you'll need access after unlinking, locate the workbook by name first so you know where it's stored. Tiller support cannot locate Excel workbooks for you.