Using command DadoJoint (DDJ):

Select 2 or more solids and call the command DadoJoint (DDJ). When selecting a plurality of solids, the program will check the contacts of each of their faces with each face of everyone else. It may take a long time. So do not choose too many solids. Any objects, except Solids will be discarded. If nothing is selected before calling the command the program will ask you to choose the parts. 

Next the program asks you to specify the depth of the dado. Enter a number greater than 0, or just press Enter. Note that the console at this point displays the 2 options:

• Gap - the distance at which it is necessary to push the dado in all directions, to provide clearance. Default = 0.
• MinArea - minimum area of contact between two solids, which is regarded as the place of manufacture of the dado. Default 16x16mm or 3/4x3/4 inch. You can assign a zero, and all contacts will be counted. 

Then everything happens automatically. The program finds the contact plane. Small contacts are discarded. The contact surface extrudes to the solid. This solid is added to the part with a smaller face area and the same solid is subtracted from the workpiece with a large face. If necessary, the solid increases in the value of the gap before the subtraction. 

If there are lot of contacts, the order of subtraction will be random, and perhaps one of the other dadoes will spoil. Check the resulting dadoes and rework again if necessary, one by one. 

Extruding is always made strictly perpendicular to the contact plane. This means that on the faces of parts that come to the contact plane at an angle a kink appears. This is not a bug. In most cases this will make a dado that can be cut without using a cutter tilt. In exceptional cases, you have to tweak the shape of the tongue and dado by hand.

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Follow the messages on the console. There may be program messages.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.

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• Possible imposition of dadoes and tenons to each other. As a result, they will get the wrong joint. It is recommended that you check the results of the work program and to alter the joint again one by one, deliberately choosing the order.
• A Kink appears on the faces of parts that come to the contact plane at an angle (non perpendicular). This is not a bug. In most cases this will make a dado that can be cut without using a cutter tilt.