Ya you can use molasses throughout. There’s probably a ton of different ways to apply, all of them that could be justified as the right way for each individual.
I like to add some silica through transition period so I don’t use a lot of molasses during that period. Or if I need to boost some calmag or whatever that pushes my ppm’s I’ll hold of or reduce on the molasses.
I think it’s more of an art than a science, and that’s with nutes in general. People see a flashy label and think they need it, and then it turns out they’re adding similar items from two or three different bottles. Then they have really high ppm levels with excess of some things and are missing others.
So the best advice I can give is to look at what you’re trying to do and how you’re trying to do it. Molasses’ biggest function is going to be feeding the microorganisms in your soil. It should in return help fight salt build up and the soil healthy for your plants to do their thing. It also includes some micro and macro nutrients the plants themselves will use. You want to make sure it’s unsulfured molasses as well. But after that, just make sure you’re not doing the same thing with other bottles.