How to Make Ramps
From Legacy Roblox Wiki
This will tell you how to make ramps.
Introduction
There is 2 types of ramps, one is easy and looks better IMO, one is harder and doesn't look right as it doesn't go in place well. The methods are: Invisible Stair Mesh Ramp (I thought of this name, but I got the inspiration to use this from Are92's Snowbound/Narrows) and the other is called um... I dunno, It uses the command toolbar.
The hard way
Make a brick, anchor it and name it "slope". Them open the command toolbar and paste this in:
game.Workspace.slope.CFrame=CFrame.fromEulerAngles(0,0,0)