See in the help file of VFP the walkthrough: Creating XML Web Services with Visual FoxPro.

You also can read it online: http://msdn2.microsoft.com/en-us/library/aza7ha5h(VS.80).aspx

Basically you have to create the webservice in your main branch. This is create a VFP Class with methods like GetOrdersbyAmount(cFilter)
GetOrdersFromCustomer(cFilter)

In each method apply the filter so you only return the needed records. Convert the records to XML using CursorToXML or the XMLAdapter.

2. In your Client convert the returned XML into a Cursor with XMLToCursor.

And that's it

Well almost, the tricky part is WebService enabling the Server.

Best Regards,

Martin