documentclass{article}

begin{document}

begin{itemize}
item ABCD
item makebox[0ex][l]{BCD}A
item makebox[1ex][l]{BCD}A
item makebox[2ex][l]{BCD}A
item makebox[3ex][l]{BCD}A
item makebox[4ex][l]{BCD}A
end{itemize}

end{document}