Do not hesitate to ask questions to me. you can also send me partial works on xls and I'll correct /return them with comments
a) the 18 elements is a limit due to interface constraints (i.e. physical): there is no room to display more elements symbols than 18 in the right-handside panel
b) we have a special parameter which is "set cohesion" (you can also alter health). The eaxct syntax can be found in the setup xls files for AACW 1861 April campaign (the early CSA and USA reinforcement armies arrive with lw health and cohesion). It inflicts a percentage reduction to the unit's basic cohesion...for instance, if you set the cohesion at 50, the unit will have 'only' 50% of its standard cohesion...