how to give centre line to oblong hole
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Heres a Tutorial for you
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Step 1:
After you have sketched your oblong hole start the "Drafting Module"
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Step 2:
Select the "Insert" tab then "Centerline" then "2D Centerline" option
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Step 3:
Change the type to "By Points"
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Step 4:
Select "Arc Center" of first Arc
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Step 5:
Select "Arc Center" of Second Arc
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Step 6:
Change the "Extension" to make centerline pass the arc
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Step 7:
Or "edit" the centerline and move the "handle" manualy
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Step 8:
Complete