You should split a large file or else let the
makeinfo-buffer command do it
for you automatically. (Generally you will let one of the formatting
commands do this job for you. See Formatting for Info.)
The split-off files are called the indirect subfiles.
Tag tables are created automatically by the formatting command; you only need to create a tag table yourself if you are doing the job manually. See Tagifying a File, for information about creating a tag table.
Visit the Info file you wish to tagify and split manually and type the two commands:
M-x Info-tagify M-x Info-split
(Note that the ‘I’ in ‘Info’ is uppercase.)
When you use the
Info-split command, the buffer is modified into a
(small) Info file which lists the indirect subfiles. This file should be
saved in place of the original visited file. The indirect subfiles are
written in the same directory the original file is in, with names generated
by appending ‘-’ and a number to the original file name.
The primary file still functions as an Info file, but it contains just the tag table and a directory of subfiles. See Tag Files and Split Files.