@Dragoon6
This is a Flat Sketch ‘A’:
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Tools > Project onto a Cylinder with the Lefthand ‘A’
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The Projected ‘A’ was Selected and pushed into the Cylinder using the Double Arrow Tool
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The ‘A’ was Extruded only [5mm deep]
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The ‘A’ was Extruded into the Cylinder [7mm deep]
If this is not helpful please describe more fully what you wish to do.