[Apple] How much disk space do the "command line developer tools" take up?
The installer says it requires 2.72 Gb of space. It installs a variety of Unix tools for compiling software, and other advanced usage (such as
git) on the command line, including 'many other useful commands that are usually found in default linux installations' (osxdaily.com). It also includes the SDK frameworks and header files for macOS APIs. And
Separating out what it is exactly that you need and what you don't is not really feasible, and may cause errors. Presumably, you're doing some kind of scripting/programming, for which other tools in the CLDT might be useful.
As @benwiggy says you cannot split up the command line tools.
However if the issue is just that you want git then there are other ways
Install command line git binary and associated tools from the Git downloads web page
Install a git GUI tool that includes its own copy of git efor example SourceTree. Other Git GUI clients are listed on the Git website