Windows 10: my pc only has 1 headphone jack so i cant use my mic and headset at the same time how can i...

basically summarized above but this main issue is that the new pc i built does not have 2 jacks one for audio and one for mic. it only has one jack which says audio/mic yet i plug in my headphones that worked on my old pc 3.5mm when i had an adapter it would plug into both jacks and output 1 jack that i could use my headphones for but on my new pc i can only hear audio and cannot speak. it is very frustrating and ive looked solutions but cannot find any. please tell me if i need to be more specific because i really need this issue fixed. and please tell me if this is an PC issue not a wind

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Wireless 3.5mm headphone/Mic jack

Im looking for something that I can plug a standard PC Headphone and Mic jack cable into from a headset and make it wireless. The Idea is that I would be able to plug the dongle into the PC's head/mic jack and have it powered by battery and the other dongle be battery powered and plug the headset into it. Make the system wireless cause I work at a call center and we are testing throat mics and they use 3.5mm jacks that go to a rj11 phone jack to the phone. I want to beable to go wireless with it too. Word Diagram:

Phone -> RJ11-x2 3.5mm jack -->wireless dongle - - - - - - - - - - - - ->wireless dongle --> Headset x2 3.5mm mic/speaker

 

Headphone mic not working with laptop 3.5mm port

I have sennheiser hd4.40 wireless headphone. I also got a cable with headphone having 2.5mm pin(attached to headphone) to 3.5mm pin(attached to mobile phone).

Problem is that when i connect 3.5mm pin to my mobile phone headphone jack, in call i am able to use mic and headphone both at same time but:

1. When i connect the 3.5mm pin to 3.5mm jack for mic on my laptop, i am not able to use the mic.(my laptop has separate 3.5mm mic and 3.5mm headphone jack)
   
2. When i connect to 3.5mm jack for headphone, only headphone is working with laptop not mic.
   

Please do not suggest why I am not using Bluetooth because it is a separate problem.

I am missing something or maybe this may be limitation or something else. Help me on this. :-(