How to include custom applications as a part of Armbian image

Greetings !

I am new to Armbian , I am using Rockpi4B for our development . I have successfully built and checked the working of the Armbian image. We have few developed application and service files . How can I include these applications and service files as a part of Armbian image.

Thanks in Advance

Radxa design and sells hardware and this is their forum.

Armbian makes and maintains software that makes this hardware alive, provide build tools and a Linux distribution. Radxa has very little to do with what you are asking.

Perhaps reading first then asking questions in would be better?

Dear igorp,

Thank you for your reply . I will go through the suggested link.