Use Modifier Groups. Go to Manage>Product>Modifier Groups>Add New Modifier
Set Modifier Group Name = Serve with ? or whatever you like.
in Adding New Modifier window, add Modifier such as 1. with potatoes 2. with rice. Click Save
-----------------------------------------------------------------------------------------------------------------------
Now assign this Modifier Groups to the product. In this case, Goulash
go to Product list>Goulash ... Now click add Property Group > choose your Modifier Group you have just set up. Click Save
-----------------------------------------------------------------------------------------------------------------------
Anyway, for auto select of a product, check this link
http://forum2.sambapos.org/index.php/topic,917.0.htmlHope this help