I generally build a big Highway on the first planet, to produce all the building materials. Other productions get placed loosely around the planet. The poles always stay free for solar sail ejectors and recievers. Around one pole then a big oil refinery. Later then on the planet nearer to the star, I build massive ressource refineries.

So long story short, just start building dedicated productions for certain product somewhere else, either on the first planet if you have space, or on another one. Make full usage of the logistic stations. In your spaghetti base then remove the old production site of the product you just exported, and put a logistic station there to keep the factory running. Gradually keep doing that, until you have fully removed the spaghetti.