Generally yes.
Add a new tab to the type of document to which you want to add a sidebar (for example, a sidebar or something else). Then add a new property or set of properties for this tab to manage your content.
Then in your templates, just add a sidebar to the layout (and edit the CSS to style the new layout) and add new fields to the template.
In the above case, this line: <umbraco:Item runat="server" field="sidebarText" />
, , . , "sidebarText" , . , , .
- , .