How to add new Chinese characters in a font file

In the font library ttf file, the steps to add Chinese characters are as follows:
1. First, you need to know the Unicode encoding of the new Chinese character. For example, I need to add a simplified character of "蔄" (sound: man), which is the beginning of the Chinese character. The following is " Question", the Unicode code is 0xE4AC.
2. Install the FontCreator software, I am using FontCreator9.1 Chinese version here, the download address is http://psoft.go976.com:801/small/fontcreator11-xpgod.zip.
3. Select File->Open, and select the ttf font library to be opened. Choose Insert->Character. First select a Chinese character similar to the newly created Chinese character, select Find Next in the search character, enter the code $E4AC of the new Chinese character in the code point, and click OK.

4. Then find the word "蔄" in the font library, right click to copy, and then find the new character in the unfinished characters, right click and paste, you can find the word at the end of the font library.

5. Double-click this Chinese character, you can edit the font of this Chinese character, select the lower part to delete, search for "question" in the font library, and copy the font to the head of the grass.

The following is the newly-built glyph. Each Chinese character has its own glyph structure, so you need to find the appropriate characters to add and modify.

6. After creating a new font, click File->Export Font->Export TrueType/OpenType font and save it as a .ttf file.