4-cable method is the definition of what you seek which splits the signal chain into 2x inputs and outputs. There are 2 ways to go about it depending on the size of the pedalboard you’re intending to setup; a single row flat board with the pedals properly oriented like the 2 I have built or if its going to be a board with several rows of pedals. Also depends if the pedals that will be the first and the last on each signal path have their input/output jacks on the sides or top mounted.
A single row: for the FX pedals I use which are the classic brands; Boss, MXR, EHX, Ibanez that have side jacks, I purchased 90 deg jack adapters by Hosa on amazon.com. Insert and keep them in the pedals at the moment you mount the FX to the board, this allows the cables to connect right up to the pedal’s side, obviously if you plan to use pedals with top mounted jacks such as most boutiques have, you wouldn’t needed this…
Multi row board: you can use a 4-way junction box, also known as a quad patch bay, a model made by Temple Audio also found on amazon.com. This would be mounted at the front top of the board, underneath if its a slanted boards, or to the side where the 4-cables would go…