Insert file feature - does it exist?

A feature of many earlier text processing systems, and large scale text formatting programs, is the ability to insert a file (containing text) into the text at arbitrary points. Is there anything similar in Musescore?

For example, I might want to take a section of something I'm working on, and save it as a file - that can be done easily - using File->Save Selection.

Later I may decide I want to reuse that either in the same, or another work. It can be done, but might require the work of a few minutes. Being able to do actions like this quickly could give benefits.

Also, it would perhaps allow a slightly different form of working, in which compositions could be made from joining together different (hopefully compatible) files, and thus permit a more structured approach.

Examples:
(1) My-Rondo = My-A, My-B, My-A, My-C, My-A, My-B', My-A'- Conclusion

(2) My-3rd-movement = Minuet, Trio 1, Minuet', Trio 2 - Fast scherzo end.

where each of the sections might be implemented by a batch command of the form:
INSERT My-A
INSERT My-B etc. or even some possibly much neater syntax - some form of compact BNF perhaps.

WYSIWYG is often very useful, but it is also too easy to forget that methods which were used 30-40 years ago were also often very productive, and can still, and should still, be used today.