In the reviewer module you can import reviewers via an excel file.
Press the 'Import' button.
Via the 'Download template' button you can download an excel file. Please leave the columns like they are, its a fixed format.
The email address and family name fields are always required.
On the 'Reviewer template' tab you can add the reviewer info. Depending on the fields and topics you use in your conference, the fields will be applicable.
On the tab 'AllowedValues' you can see for for example the pull down fields what you can fill in.