How to create Timeline in C++?

I want to create this timeline in C++ with same functionality, I searched google and not found the solution.
I can create it in blueprint, but I want to learn it in C++ also. Thank You
Visual Example:

Hi Alexa.kl,

The forum post below has the information you need:

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Thank You very much for help , I checked the post and understand a little bit, I am new to C++ , I will try my very best to implement it. Thank You very much )

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Thank You, I am using UEv4.20 and for me some of the lines are not working , but I will figure it out, the main thing I got a nice idea