shell spindle
so i wanted to ask the devs to add a new QOL feature and realised it was already implemented, but since its kinda hidden i thought id share it here with you.
you probably have your big book of all your blueprints, the one problem is: your early game blueprints use yellow belts and inserters and your late game blueprints use blue or green belts and inserters.
i already found you can edit upgrade planners to change similar buildings to specifically what you want, and even that you can apply a custom upgrade planner to an existing blueprint. but i found that you can even apply the upgrade planner to a blueprint book.
in conclusion: make an upgrade planner for the stage of game you are in right now, then (deep) copy your book with all your blueprints, then apply the upgrade planner to the book. you now have a book with ll your blueprints, but using buildings that reflect your current progression.