Currently there are two operations you can do in bulk mode, which in many cases do essentially the same thing:

• Drag-And-Drop lets you move a selection of issues within a structure or add them to a structure from the secondary issue panels, such as Issue Clipboard or Search Results.
• Cut and Paste allow you to move issues both within a structure and between different structures.

To select multiple issues in a structure, highlight the first issue you want to select and press the Space key. A column with check boxes for issues selection will appear. Move around the structure using a keyboard and select other issues you need using the Space key or use the mouse to select the desired issues.