If you are connecting via Hamachi vpn to a local computer in your office, then you are probably working this backwards. With Hamachi installed and your clients in the field, all they need to do is click on their desinated Mapped drive on their laptop or remote office desktop to allow remote access to you local server files or folders.
Since I think you have created logon accounts to your server domain, then I would just make sure you add each remote user to Hamachi then using there logon and assuming the hamachi client is installed on ther remote users laptop or remote office desktop Hamachi on your server will Assign a finger printer access key soon after they get to the server. Then they will be able to see the server from anywhere they are remotely hooked up to wi-fi or networking facility.
Please rememeber that an AUTO.BAT file for mapping your drives and folder is installed to allow for automatic mapping for the remote users.
example ; vendors.bat would allow them to get to drive c:\vendor folder\excel spreadsheets\*.xls.
example; purchasing.bat would allow them to get to drive e:\purchasing folder\sales proposals\*.doc
example; truckdriver.bat would allow them to get to drive d:\drivers folder\log books\*xls and or *.doc.
a bat files sometimes would look like this ;
example net use c: \\servername\foldername\vendorfolder
example net use c:\\servername\sysfolder