How do i input text on my 3D Model In Catia V5

You have to use file conversion. First open a drawign file in catia. Create text with font arial true type. Then save it as a .dwg

Then open this dwg file in catia. Then select text and copy it.

Then go part design create sketch and paste text.

Yeah there is another fonts also. But not all of them. If font has thinkness, it will work.

using the drawing (dxf) method results in a bunch of line segments.

try www.textsketcher.com