Hey everyone!

There are quite a few ways to make custom supports in OpenRCT2. One method that is quite popular, especially for heavy tracks, is to use pieces of Roto-Drop and Observation Tower to make the supports. The Tile Inspector allows you to simply copy and paste these track pieces wherever you want them. As long as there is something 4 units above them, they will not draw with a large top piece on top of them. 

There is also a Mekkit Tutorial if you want to read more about this: https://www.dkmp.wtf/mekkit-university-004-tower-supports