InterBeta is a tool for filling in large CPTs, when the parents and children are ordered or discretised-continous nodes (it also works with binary nodes).
In the very simplest case, you only need to specify a top and bottom CPT row, and the remainder will be automatically interpolated. More commonly, you will want to specify weights for each parent.
To get started, you can load an existing Netica .dne file (via "Load .DNE" at top left) and choose your node. Alternatively, you can create the CPT structure inline by clicking 'Add Parent' and changing the states as you need. (Note, you can change states by clicking 'Change' or by editing them inline directly.)
NOTE: To delete a state, just delete it's name.
Once you've setup your CPT, enter the "Top CPT Row" (i.e. the row in the CPT corresponding to the first state of all parents) and a "Bottom CPT Row" (i.e. the row in the CPT corresponding to the last state of all parents) and click "Generate Beta Table".
You can change parent weights by editing them inline. Most of the time, you will just want to change the parent's overall weight relative to other parents. You can do this by changing the top state weight --- this will auto-scale the other weights.
NOTE: You will usually want to leave the bottom weight at 0, as it won't affect anything in most cases.