Is it possible to have the number of days allocated reduced by added multiple resources. For example if I put 10 days in for a task, but then add 2 member sof staff to it i would like the number of days on the chart to reduce to 5 days.
It is called “effort-driven scheduling” and it is not supported, sorry 
OK, thanks for reply. is it likely to be added in future?
Maybe, but no promises.
Thanks you Dmitry. Will wait and see.