Trying to assign a sequence of characters to one glyph

Hi all! I’m very new at creating fonts and need some help. I will try to best explain what I am trying to do, and any help would be appreciated.

I would like to change a certain sequence of characters into one glyph so that:

tftftftf

can be assigned to one glyph to appear as whatever I “draw” in the glyph such as:

VM

I read something about opentype and combining glyphs, but I need this to remain as a TTF file…

Any ideas would be greatly appreciated.

Thanks for reading!

Simple Truetype fonts don’t support glyph substitutions, which is what you seem to want. Only OpenType font features can do this.

If you want user to type “a word” and the font to convert that to “glyph” then I don’t see any other way than using OpenType.

What application(s) must this font work in? Please explain more specifically what your aim is.

I am trying to edit arialbd to contain a combined glyph, and then replace my old arialbd with the edited one.

This is because a certain program uses arialbd. If I create my own opentype font, then I cannot use it within the program because it only uses arialbd. Unless there is a way to overwrite arialbd as .OTF and then the .OTF will still show up in the program…

And yes, that is pretty much exactly what I want it to do.