The alora and evolve themes permit users to create an unlimited number of custom sidebars. These sidebars can then be included on a Post or Page simply by selecting its name from the Sidebar page option drop-down list.
(Note: Controls my look slightly different in the two themes, but the principles are the same.)
Create a Custom Sidebar Area
The first thing you’ll need to do is to create a new sidebar area by going to Appearance > Sidebars > Add New Sidebar.
Add Widgets to Sidebar
Once you’ve added a sidebar, go to your widgets page (Appearance > Widgets), and you should find your new sidebar (i.e. widget area) present on the page.
You can then drag whatever widgets you like into that sidebar.
Select to Display Sidebar
You can now choose to display that sidebar into any Post or Page instead of the default sidebar. Simply look for the Sidebar controls below the post editor area and select the sidebar you’ve created.
You can also control the sidebar position.
You should then see your newly created sidebar area replacing the default sidebar.