Zenkit

You can use normal copy and paste functions in Zenkit to transfer text or numbers between cells. 

Select the text or number you'd like to copy, then click Ctrl/Cmd+C. Navigate to where you'd like to paste it, then click Ctrl/Cmd+V. 

As well as duplicating within a list you can also copy an item to another list. To do so click the "..." symbol on the expanded item panel, click "Copy to list" and choose the list you want to copy the item into.

Because the fields may vary in different lists you will be asked where the field of the copied item should be transferred into inside the new list.

To learn more about shortcuts in Zenkit.