The aim is to have one `.cfg`-file for each department. In this department all things are defined that are e.g. not person specific. The `.cfg`-file should be applicable to letter, beamer and poster. Here is an approach. However as far as I see in the `rwth-letter.sty` there is no `\c__ptxcd_base_str` filled. (cf. https://gitlab.git.nrw/rwth-it-center/rwth-latex-templates/rwth-ci/-/blame/main/tex/rwth-ci.dtx?ref_type=heads#L209) ``` \ProvidesFile{rwth-itcenter.cfg}[2026-11-15 Common information about IT Center] \ExplSyntaxOn \str_if_in:NnT \c__ptxcd_base_str {letter} { %------------------ letter \setkomavar{frominstitution-short}{MYINSTITUT} \setkomavar{frominstitution-id}{010420} \setkomavar{fromaddress}{Musterstraße 7\\52074 Aachen\\GERMANY} \setkomavar{fromurl}{https://mi.rwth-aachen.de/} \setkomavar{fromvat}{DE\,121\,689\,807} \setkomavar{fromtax}{201/5930/5005} \setkomavar*{frombank}{RWTH Aachen University} \setkomavar{frombank}{ Kontoinhaber\\ Name der Bank\\ Konto 000\,000\,000\\% optional BLZ 000\,000\,00\\% optional SWIFT-BIC: ABCDEF1\\ IBAN: DE00\,0000\,0000\,0000\,0000\,00 } %--------------- letter end } \str_if_in:NnT \c__ptxcd_base_str {beamer} { %------------------ beamer %.... } \ExplSyntaxOff ```