[UNANSWERED] Retaining model rotation when moving via primary cframe?

How can i retain the model rotation when moving model using SetPrimaryCFrame?

Because whenever i rotate the model by any degree and move it, the model don't retain the rotation i set. This is a problem i'm currently have with my model dragging script...

The rotation script.

mouse.KeyDown:connect(function (key) -- Safe rotation
    pcall (function()
function rotateMod(mod,rotation)

    if key == "r" and _G.target:FindFirstChild("CanRotate") then 
local center = mod:GetModelCFrame()
    local parts ={}
    local function scan(parent)
        for _,obj in pairs(parent:GetChildren()) do
            if (obj:IsA("BasePart")) then
                table.insert(parts,obj)

            end
            scan(obj)
        end
    end
    scan(mod)
    for _,part in pairs(parts) do
        part.CFrame = (center*rotation*(center:inverse()*part.CFrame))
    end
end
end

rotateMod(_G.target,CFrame.Angles(0,math.rad(10),0))
end)
end)

UPDATE

Abstract_Life answer doesn't work it shows error . This is the output, i am so stupid i forgot i had pcall function on the rotation script that's why it wasn't sending error. But i removed it and this what it says "Players.Player1.Backpack.LocalScript:8: attempt to index local 'mod' (a nil value)" , This is the error when i replaced the line 24 with rotateMod(_G.target:SetPrimaryPartCFrame(CFrame.new() * CFrame.Angles(0,math.rad(10),0)))

Okay, What your doing is rotating every single part in the model, on its own axis. Roblox came up with this thing called,

SetPrimaryPartCFrame()

Wiki Link

You can use this by doing so;

Model:SetPrimaryPartCFrame(CFrame.new() * CFrame.Angles(0,0,0))

The only issue with this is, You need to set a primary part under the models property tab. When you set the primary part, remember that the whole model will orientate(rotate) around the center of this primary part. I usually create a brick, make sure its length's are the same, and set the center of it as the model.