Modeling web based decision tables

I am trying to build a web based application that will help business to design/define non-technical business rules using a decision table concept. My decision table would look something like this,

I am also planning to add functionalities like 1) Adding new Fact/Rule/Action 2) Removing Fact/Rule/Action.

I will be having more than 100 sheets grouped under various categories where each sheet can move the focus to another sheet in the same category or to a different category itself. Currently we are using Microsoft excel to represent this as shown in the snapshot.

Question: 1. What is the best way to represent this? 2. Is/Are there any web widgets that I can use.