If I understand correctly you just want your attribute options to be displayed as a drop down menu. This is possible to do within ArcGIS but you need to work with a geodatabase to achieve this.
Whithin a geodatabase you can set up your Domains, which in a nutshell is a list of all the possible values that a field can have. So once you create your domain, you assign it to the necessary attribute. So for your example, you create a Domain with North, South, East, West and then assign it to the InvFrom and InvTo fields. Once you start editing in ArcGIS10, and you display a selected features attributes, you are able to choose from a drop down menu the options you have stated.
Look up the help menu in ArcGIS and look up Domains in case you have more questions, or post back here if you need more assistance.