Publishing an excel file on Sharepoint for multi-editing

[Reza]

I have an excel file that I would like to publish on our Company's Sharepoint
web site. I use "Shared Workspace" to do this but it doesn't allow
multi-editing on the site (same as "sharing workbook option"). This means
that not more than one person is able to make changes to the document at the
same time. Can someone guide me please as how I can publish a document that
's shared for multi editing please.

Thanks