To easily combine two folders into one larger folder for a diagnostic, formative, or summative assessment (or just practice), follow the steps below:
Click on the Folders tab in the top right corner.
Choose the first folder that you would like to merge, select Actions, and then Edit and Assign.
Select all the questions or choose specific questions you'd like to merge by click on the box next to the question title.
Select Add to folder to add these questions to a new merged folder.
Repeat the steps for the second (or more) folder that you would like to merge.