How do I edit which Bookrouter Marketplaces an individual item is in?
Click on 'Manage Inventory' link under the 'Inventory' heading in the Control Panel menu.
Step Two: Find the item you wish to edit
Use 'Find by ID' or 'Keyword Search' textbox to find the Item. (Or you can use 'filter' icon next to keyword search textbox for 'Advanced Search')

Step Three: Click the edit icon
Click the 'Edit' button at the end of your item to open to it's settings page.

Step Four: Open the Marketplaces tab
Click the 'Marketplaces' tab to access marketplace-specific settings.
Step Five: Make updates
Turn on the toggle switches for all the 'Marketplaces' you'd like your item routed to.
Step Six: Don't forget to save
When you are finished with changes, be sure to click the 'SAVE' button at the top to finalize.
