In my experience, it’s not even worth trying to put everything in the published manual. Very few read it thoroughly, and if it was fully comprehensive, even fewer would read it thoroughly.
The Help File topic on the Glyph Transformer points to the Tutorials, where one can find a PDF and a link to my tutorial on Working with Transformations, where one can find this:
In the script — Bold (14,7) preserve bearings — means: add 14 funits to each side of vertical strokes, add 7 funits to the top and bottom of horizontal strokes, and preserve the side-bearings, i.e. add 28 funits to the advance width. Move (0,7) will move the glyph contours up by 7 funits to compensate for the bold action of adding 7 funits to the bottom of the glyphs horizontal strokes, thus keeping the X on the baseline.
That’s not a criticism of you, but there is a lot of information to read through to learn all aspects of a powerful program like FontCreator, and the number of features has increased enormously since FC5.6. No one could hope to find it all even after several months of using the program. That’s why support forums are so useful. Here, you can tap into the knowledge-base of users who have spent thousands of hours using the program, and with a range of artistic and programming skills.