I have this Instance.new part and I changed most of it's properties except I'm not exactly sure how I would rotate it.
local Blast = Instance.new("Part")
Blast.Name = "Blast"
Blast.Shape = Enum.PartType.Block
Blast.Size = Vector3.new(9.38, 0.29, 0.26)
Blast.Material = Enum.Material.Neon
Blast.BrickColor = BrickColor.new("Toothpaste")
Blast.CanCollide = false
Blast.Parent = game.Workspace
Blast.Transparency = 0
Blast.Orientation = Vector3.new(0,0,90) --What I'm having trouble with
Blast.CFrame = Character.HumanoidRootPart.CFrame*CFrame.new(0,0,0)

2 comments
You have to be a little more specific. How do you want to rotate it? Upside down? Point towards another part? etc.
You can multiply the part’s CFrame. Part.CFrame = Part.CFrame * CFrame.Angles(0,0,math.rad(90)).