If a font already has such a ligature, you can generally activate it by using the “discretionary ligatures” (dlig) OpenType feature. The program you’re using has to support OpenType.

This might turn into an interesting challenge for you. First of all, there’s no standard “shortcut” for the c_t ligature. Second, *if* a font has the c_t ligature, that glyph will be either unencoded or encoded in the PUA block because that ligature is not part of the Unicode repertoire (unlike the s_t ligature at U+FB06 and other ligatures that were encoded for compatibility reasons).

Then, assuming the font has the c_t ligature, there are two scenarios:
1. If the glyph was encoded in the PUA block, you’ll be able to insert it in most applications (e.g. Word, InDesign) and you’re likely to find it at codepoint U+E077. An example of a font with encoded c_t ligature is Adobe Garamond Pro

2. If the glyph was not encoded, you will need an OpenType-savvy application (e.g. Illustrator, InDesign) to access it. An example of a font with unencoded c_t ligature is Arno Pro
Note: unencoded glyphs are not accessible via Windows Character Map, nor via Mac OS X Character Palette.

Miguel,

That worked perfectly.

Thanks!

Jon.