How do I change only the Y value of a part's orientation?

Hello Zeppelin0330,

I got my answer from this page: https://developer.roblox.com/en-us/api-reference/property/BasePart/Orientation

local part = script.Parent

local incr = 360/20

-- Rotate the part continually
while true do
    for deg = 0, 360, incr do
        -- Set only the Y axis rotation
        part.Rotation = Vector3.new(0, deg, 0)
        -- A better way to do this would be setting CFrame
        --part.CFrame = CFrame.new(part.Position) * CFrame.Angles(0, math.rad(deg), 0)
        wait()
    end
end

Hope I helped!