Roads symbology level to topology road

[CinnamonRoll]

Hi everyone,

Recently I encounter a problem related to topology and cartography.

I got 5 layers of different class of roads( primary, secondary....), and merge together into 1 layer, using symbology level to show the hierarchy of those roads.(According to figure1)

Figure1

However, roads are complex, there are many sun-line or roads within the bigger one(see figure2)

Figure2

So, what I want to do is to reduce these extra lines into 1 line, only show the topology connection of these roads, and also remain the hierarchy between these levels(red, orange, yellow...). 
I'd like to know how to solve these problem:

1.how to transform these roads into topology roads, which make it simpler)
2.At the same time, how to transform them into topology and also keep the hierarchy?

This is my first time asking question here. Welcome to any kinds of suggestion! Thanks!