While being on test cases page, you can perform bulk operations on more than one test cases. The supported bulk actions are:
Update (Edit)
Duplicate (Copy)
Add test cases to existing test plan
Create a new test plan with selected test cases
Copy test cases to another project
Delete test cases
Selecting test cases
You can select 2 or more test cases on the grid by using the checkboxes.
Lazy loading and selection of all test cases
Before we delve into selection of all test cases let us discuss lazy loading...
Lazy Loading : When you navigate to test cases page or apply any filter on test cases list the first 50 records are loaded initially by default, in the order you have chosen. Now, when you scroll the list down the next batch of 50 records are loaded.
If you want to select all the test cases for the operation then click the checkbox in table header, with this only the records loaded so far are will be selected.
If you wish to select all the test cases that are there in project or match the filter criteria currently applied, then click on "Select All" link on bulk action bar.
Once the test cases are selected the bulk operations can be prformed on them.