Although Bike doesn’t currently have a dedicated feature like a “scratchpad,” I think a combination of existing features might help achieve a similar result. If you don’t mind, here’s how I usually handle this kind of situation:
In Bike, you can open the same document in multiple tabs or windows using the Duplicate Tab or Duplicate Tab to New Window options under the Window menu. Additionally, with the Focus In feature in the Go menu, you can display only specific parts of the same document in each tab or window you’ve opened.
When I need a “temporary zone” as a reference in a separate view, I usually create a new parent row named something like “temp” and place any relevant content as its child rows. Then, I use
Duplicate Tab to New Window to open the same document in a new window. In this new window, I move the cursor to the “temp” row and apply Focus In. This way, it displays only the “temp” row and its children.
For even greater efficiency, you can set up keyboard shortcuts to automate this process. More information about the automation can be found in this discussion.