How does one make a child of one player controller or gamemode blueprint class to another one?

If I have player controller A and I have player controller B. How do I make player controller A a child of Player Controller B?

Same for game mode.
If I have Game Mode A and I have Game Mode B. How do I make Game Mode A a child of Game Mode B?

I couldn’t find any documentation on this.

Please use images. Thank you very much to anyone who helps me.

Class Settings > Class Options > Parent Class.