Form Czechoslovakia is the decision that forms 
Czechoslovakia.
It follows the requirements of the usual formation decisions. The forming nation needs to have Czech or Slovak culture as primary culture, have 45 prestige and own/sphere all the Czechoslovak cores. It also requires the forming nation to be at peace.
No independent nation can take the decision, but 
Bohemia-Moravia and 
Slovakia can be released from 
Austria and take the decisions.
Czechoslovakia can also be released fully by Austria