Click the Link bar menu option and select Add Link
A new catalogue record appears with the basic details already entered that identify the Host record and where to find it
Type the Title of the part in front of the [Part of...] details
Add the Author / Artist details in the Author field as normal
Don't change the Site / Call Number details... they are already correct!
Add Co-author, Keyword and Subject information as necessary
Keep adding Linked parts as necesary...
Note:
As mentioned in the summary of Linking Resources you don't attach a barcode to Linked items, only the Host has a barcode
You might want to add a Linked record to the Host only for "important" articles or parts of the collection. Other details can be listed in the Notes field of the Host record so researchers can find the details via a Notes search
Don't forget to mention the Title of the item and the Author / artist details in the Notes field if you choose not the add Linked records for each part of the collective work
Some catalogues contain notable quotes from song lyrics or poems in the notes field so people can locate resources by searching for some of the words they know! (It's all about Time VS Usefulness!)