When opening a data source in EPSG:25832 in a project with crs set to EPSG:31468 I'm prompted to select a datum transformation (e.g.
The nationwide standardized gridfile for the transformation of geotopography data BeTA2007 is already available and though implemented in QGIS.
By jan, 2019 the Freistaat Bayern / Germany switches coordinate reference system from EPSG:31468 to EPSG:25832 and for this purpose is going to provide an NTv2 gridfile "BY-KanU" („Bayern-Kataster nach UTM“). Various gridfiles are available in advance: https://www.ldbv.bayern.de/vermessung/utm_umstellung/trans_geofach.html from where I obtained a gridfile
The question is, how to use these gridfiles in QGIS (applies for 2 and 3 as well)? Under Settings | Options... | CRS it seems that I can define my own transormations, but I wonder how and where to select the desired gridfile?