This will only give you half way of what you want.
Goto "Insert -> Object -> OLE Object"
Select 'Create from file',
Choose the file you want to link,
Make sure to check 'Link to file' checkbox.
Unfortunately, this will not update the contents automatically.
You have to goto "Edit -> Links -> Update"
And you can't even update it manually during the slideshow. You have to
end slideshow before you can update the links.
Only DDE(Dynamic Data Exchange) from Calc can be automatically updated,
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