In your above path, your local site folder would thechnically be "httpdocs" that's the folder that holds your site's home page, index.htm.
I wouldn't use that path though, there's no need for the httpdocs folder in this instance. Just use your "doman.com.au" folders directly... although I would also drop the ".com.au" from it, to make it simpler. Your paths for each home page could then be...
D:/01_htm_websites/domain1/index.htm
D:/01_htm_websites/domain2/index.htm
D:/01_htm_websites/domain3/index.htm
With the example above, in DW, the Local Root Folder would be simply "domain1, domain2, or domain3" all contents of those individual folders would be uploaded to each site's Server Root, which is determined by your hosting company (usually www, htdocs, or public_html, but could be anything your hosting company declares).
Without a testing/development server, there is no Local Server Folder
Your Web URL is determined by the domain name you purchased and is the www-dot-whatever that your site resolves to, once hosting is purchased for the domain.