>>My advice is to keep it numeric, and just do this sort of makeup for display purposes. If you're keeping it in a textbox, set the texbox's .format="L", .inputmask="999". You may want to remove the format when it gets focus and restore it when it loses focus, to ease the data input.
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>Thats exactly what I plan to do Dragan - just handle the displays. Could this also be displayed in a combo box?

Combo converts everything into strings, anyway. You can stuff the string versions of your values (transformed like above) into an array, and use the array as the rowsource for the combo.