To produce a MC sample, first search for the dataset in McM, in this spreadsheet https://cms-pdmv.cern.ch/mcm/requests?dataset_name=ZprimeToZhToZhadhtata_narrow_M-1000_13TeV-madgraph&page=0.

When the dataset is found open the “get setup command” using the button near the prepId cell and this will display the production commands.

Is it possible to change by hand some of the configurations,i.e. one can force some particle to have some specific decay. For instance these lines

'23:onMode = off', '23:onIfAny = 15'

will make the produced Z bosons decay only into taus.

Remember to change the number of events(default is 15).