Prerequisites
A: User must be logged in.

1. Select a Release by selecting
Project Name > Version Tree
See how

2. Click on icon at any particular view box.
If view box is collapsed, you will need to expand the view box using icon in order to see it.

3. On the next page, select single package or multiple packages (by holding CTL or SHIFT key while selecting) from the list,
then click NEXT.

4. On the next page, select a Base View where you want your packages to appear.
If you want to create new Base View, click on icon.

5. For each selected package in step 3, type in a package version OR click on icon get all existing versions.

6. Click on ADD button to finish.

Package(s) will be added to a release into a selected Base View.
If you were using personal view box to add the packages, the same will be added to your personal view settings.

See also
Add NEW package(s) to Release, Remove package(s) from Release