@UserSupport That's for an entire net.. I want to do a part of a net.. For example, in my pcb there is more current flowing to a load than to a zerocross detector (optocoupler) so the part between the ac-in, the  triac and the load has to be wider than the part between the ac-in and the optocoupler.

I can change this by hand after autorouting, but it would be nice if I can specify this somewhere.

@jeroenst,

1. If you mean define the width of a track so that it is different at different segments along it's length, like this:

then you have to draw the track as separate segments and change the width of the relevant segments either as you draw them or after drawing them.

2. If you mean define the tracks for some nets to have different widths from others like this:

1. NET_A is defined as WIDTH_1
2. NET_B is defined as WIDTH_2
3. NET_C is defined as WIDTH_3

Then you can use the Design Rule setting dialogue box:

Tools > Design Rule...

@andyfierman
I have the same problem, but I think Andy is not understanding the issue. I have a +5 net where I need bigger tracks to a pin on the PCB, and thinner tracks to some IC's on the PCB. Changing the size after autorouting doesn't always work. If I make the tracks big then there isn't always enough room to route. If I make them small then there isn't often enough room to make them bigger after autorouting. I have tried make two different nets, but as soon as I connect them the autorouter thinks they are the same net. I have also done it by manually laying out the big tracks first and locking them, but that is extra work that I would like to avoid.

"I have the same problem, but I think Andy is not understanding the issue."

Sorry but no you don't and yes I did.

You are replying to a thread from 2 years ago which was asking a different question from yours and which was answered in the context of that question.

Your situation is different and in the present state of EasyEDA the solution is to route the variable width segments manually as has been described in replies to several other recent posts on the same situation.

For example:

https://easyeda.com/forum/topic/How-to-make-different-track-widths-for-same-net-72f127f5da2740dd8d2acc2fffc4a1a6
https://easyeda.com/forum/topic/Autorouter-Mixing-trace-widths-for-same-net-0015deb9d8b84b97810995e907e268cc
https://easyeda.com/forum/topic/How-to-increase-track-width-gradually-b8e381db93364bb6a8439bc24f5ee970

There are a couple of ways to change the trace width on the fly during manual routing:

https://docs.easyeda.com/en/PCB/Route/index.html