Create Site
Creates a site anywhere within the SharePoint environment.
Options for this action
Title
The Title is the name to be assigned to the site. You can manually specify the value or build the value dynamically at run time using 
(Insert Reference). For more details please refer to Inserting reference fields.
Description
The Description is a brief statement about the site. You can manually specify the value or build the value dynamically at run time using (Insert Reference). For more details please refer to Inserting reference fields.
Inherit permissions
Specifies whether or not to use the same permissions as the parent site.
If permissions are not inherited, a site owner must be specified. The site owner is the person who will manage the site being created and will be given Administrator privileges for the created site. For more information on privileges and permissions, please refer to the SharePoint Help Files.
To search for users or groups, click 
(Browse) on the right of the text box to access the Select People and Groups dialog box. For more information on this dialog box, see Select People and Group dialog box.
Parent site
The Parent site is the site that will contain the created site.
- Select a parent site enables a site picker (Select a team site) to navigate through the portal structure and select the location to create the new site.
- Enter a URL allows manual entry of the URL or selection using Insert Reference.
URL name
The URL name is the web address relative to the specified parent site (do not include the full site URL). For example: http://myportal/sites/<URL name>
Template
The SharePoint site template to be applied to the site being created. If multiple languages are installed in the environment, an option to choose the language for the site is available.
Click on the drop down box and select the desired template.
For more information on SharePoint site templates, please refer to the SharePoint Help Files.
Display on the Quick Launch of the parent site
This option displays a link to the created site on the left hand navigation (Quick Launch) of the parent site.
Display on the top link bar of the parent site
This option displays a link to the created site on the top navigation of the parent site.
Use top link bar from the parent site
This option ensures that the created site uses the same top navigation as the parent site.
Store URL in
Stores the URL for the created site in a text workflow variable.
Override credentials
The site will be created using the current security context of the workflow by default. This can be the rights of the initiator or the rights of the workflow owner.
If an override username and password is provided, the workflow action will use the permissions of the provided account to create the site instead.