It would be very simple to also write a script that will do this.
You can loop through the number of variables you have and output their name, type and value into a file, then read them back in another project to add them.
Very rough psuedo code.
function outputVars() {
var count = Project.Variables.VariableCount;
var name, type,value;
for(var i = 0; i < count; i++){
name = Project.Variables.GetVariableName(i);
value = Project.Variables.VariableByName(name);
type = Project.Variables.GetVariableType(Project.Variables.VariableByName(name))
//code to write to file
}
}
function insertVars() {
//code to open file
for(lines in file) {
if(!Project.Variables.VariableExists(varNameFromFile){
//add var and type
}
//set var value etc..
}
}