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Click on the Section Manager icon in the Control Panel or click on 'Section Manager' in the 'Content' menu on the back-end of your Joomla! installation.
The Section Manager is where you can edit existing Sections and create new ones. Articles in Joomla! are organized into Sections and Categories. Sections are the top-level of organization and Categories go under Sections. For example, a web site might have the following organization:
In this example, 'People', 'Projects', and 'Events' would be the Sections. The sub-topics under each Section (for example, 'Volunteers', 'Staff', and 'Board Members') would be the Categories for each Section. When an Article is added, it would be assigned a Section (for example 'People') and a Category (for example, 'Board Members').
You can have an many or as few Sections and Categories as you need. Joomla! has a built-in Section and Category called 'Uncategorized'. This allows you to create Articles without creating or assigning any Section or Category. You just assign the Article to the 'Uncategorized' Section.
Sections are used for two reasons. The first reason is for organizing Articles on your web pages. The Section Blog Layout and Section Layout allow you to display multiple Articles on a page for a given Section. So, in the example above, you could have a page for 'People' that shows Articles related to this Section. A second reason to use Sections is to help manage your Articles in the back-end Article Manager. If you have a large number of Articles, you can filter by Section so you only see the Articles one Section.
Click on the column heading to sort the list by that column's value.
Checkbox: You can select this box to select a section. You will need to do this for several actions, for example editing and deleting.
Title: The title of the section. When you click on this title, you will go to the edit page of this section. You can find the help screen about this part of the Section Manager here: Screen.sections.edit.15.
Published: In this column you can see whether the section is pubished or unpublished. A green hook is shown when the section is published, a red cross sign when the section is unpublished. Click on the icon to toggle between published and unpublished.
Order: The order of the sections. You can change this order by changing the number and click on the save icon at the column header, or by using the small green triangles.
Access Level: The access level of the section. It will display the word Public (everyone can see it), Registered (all logged-in users can see it) or Special (every one with a higher group then 'Registered' can see it). Click on it to toggle between the different access levels.
# Categories: The number of categories within this section. The categories can be made for a section in the Category Manager.
# Active: The number of active articles within this section. The active articles include the published and unplished articles, but not the trashed ones.
# Trash: The number of trashed articles from this secticon. These articles can be found at the Article Trash. You can restore or delete them there.
ID: The ID number of the section. You can not change this number.
At the top right you will see the toolbar:
The functions are:
Publish: Select one or more sections who are currently unpublished and click on this button. The selected sections will then get an unpublished state.
Unpublish: Select one or more sections who are currently published and click on this button. The selected sections will then get a published state.
Copy: Select one or more sections and click on this button. Fill in the title for the new section, and click on the Save button. A new section will be created with the categories and articles from the copied sections.
Delete: Select one or more sections and click on this button. The sections you selected will be deleted.
Edit: Select a section and click on this button. You will enter the Section Manager - Edit page. More information about this page can be found here: Screen.sections.edit.15.
New: Click on this button to create a new section. You will enter the Section Manager - New page. More information about this page can be found here: Screen.sections.edit.15.
Help: Click on this button to access the Help Screen for the Section Manager. That is the same screen you are reading right now.
You can filter the list of items either by entering in part of the title or the ID number. Or you can select a Published State.
In the upper right area, above the column headings, is a drop-down list boxes that allows you to filter the Sections by Published state.
When you change the state of a section, this section will not be displayed in a Section Layout or a Section Blog Layout. When you create a new section, you can choose this section when creating a new category or a new article.
More dependencies about editing the sections can be found here Screen.sections.edit.15#Dependencies.