You create a constant node by adding a nature node to the net, bringing up its node dialog box, and choosing “Constant” from the node kind selector. You can also set other characteristics of a constant node in the same way as any other node, such as giving it state names.
To set or change the value of a constant node, enter the value in the same way as you would enter a finding.
For Equations: You can refer to the value of a constant node anywhere in any node equation by using its node name as you would a parent node. It should not appear in the argument list to the left of the = symbol. No link is required.
When you convert the equation to a table, the value of any referenced constant nodes will be used. If you change the value of a constant node, you must rebuild the table for the change to take effect.