Check out this commit: 1f9fcee

Particularly changes to:

for the pattern on how to make other widgets DRY-er and how to implement Slabsections (only one I didn't get to).

Of particular note:

1) the constructor that takes a connection type as QString connectionType in ConnectionInputWidget.cpp 2) the outputToJSON and inputFromJSON member functions which take QJsonArray (rather than QJsonObject) in ConnectionInputWidget.cpp - pay attention to "bolt group ", or check out FramesectionInputWidget.cpp for an example of "longitudinal rebar " and "transverse rebar " field handling. 3) the QStringList theConnectionTypes, defined in InputWidgetSheetBM.cpp, and the various places in that file theConnectionTypes is used to iterate over QMap<QString, ConnectionInputWidget> theConnectionInputs.