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I was not satisfied with appendices defined via
\appendix
\chapter{First}
..
\chapter{Second}
..
and tried to use just one chapter named Appendices and a number of section within it. And I need also to use another name instead of "Appendix" for sections, so I wrote something like

\renewcommand ...

Thank you! \global\setlength does work properly !

The problem is that all length-commands, e.g., \setlength, are local, meaning that old values are restored when going out of a group of commands surrounded by {..}. Is there any way to make length-assignments globally defined provided they are made within the group of commands?