The pictures are unclear, but it appears that you have the bypass block already.
First rule of hydraulics is the path must always be complete. That is what that braided line is for. If you removed it and capped off those ports, your hydraulics would be deadheaded (blocked off), and something would likely blow from the pressure.
However, that braided hose appears to be a TOILET SUPPLY LINE!!! Don't use the hydraulics until you can replace that line with a real hydraulic line. That stuff is only rated for about 120PSI, and your hydraulics can develop 1200PSI. Hydraulic lines are rated for 2500PSI and up.
You need an OPEN CENTER hydraulic spool valve to control the cylinder. If you want to control multiple functions buy a valve with the number of spools you need. 1 spool, 2 spools, 3 spools, etc.
IIRC, the port on the left (uppper if looking at the tractor) in your picture is pressure, and would connect to the IN on the new valve. The OUT from your new valve would connect to the port on the right (lower if looking at the tractor) in your picture. The work ports would connect to your cylinder.
It's been a while since I've done one of these so I may have the IN and OUT ports backwards.
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