Cannot Extended Partition

Hello

I have a pc running windows 10 64 bit pro

I installed the system but purposely made an initial small partition in case i can to transfer it to a SSD that is small or use the other partition to further break it into like 3 or 4 OS.

Anyways i scrapped those ideas so i just wanted to extend the 80GB partition

However the option is greyed out and won't let me extend it

Is there anyway to extended the partition to use the extra 300gb+ I have without having to reinstall the OS?

thanks

 

This article deals with your exact situation. However you have the option to leave things as they are and just create a new partition in the unallocated space and use it for your data. That's how all my computers are set up.