Binding (unlike Upgrades) allows multiple classes to be grouped together like branches on a tree, whereas Upgrades are a singular one-to-one relationship.
Think of the bind number as a junction box, with a series of conduits from one or more classes to one or more others.
To illustrate, I'll use the class slot numbers from a mod I'm currently doing:
You want to make a convervsion path
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from your CL Omaha class (avail 12/41) in slot 407
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to your CLAA Omaha class (avail 12/41) in slot 809 AND
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to your CVL Omaha class (avail 12/41) in slot 814
So, in our minds, let's create Bind 1401.
In slot 407, check the box "Convert
from class" and enter 1401 the box to the right of it.
In slot 809, check the box "Convert
to class" and enter 1401 in the box to the right.
In slot 814, check the box "Convert
to class" and enter 1401 in the box to the right.
You now have set your conversion path FROM CL Omaha TO either CLAA Omaha OR CVL Omaha.
Be sure to add the number of days in the "Conversion Delay" box if you want it to take time to do the conversion, and the "Upgrade Shipyard Size" if you want the conversion to be done in a port with a Repair Shipyard of appropriate size (e.g. "10" = 10,000 ton minimum Repair Shipyard).
