Design pattern for if-else with common logic within the conditionals

I have to implement a solution where the code behaves differently according to a different condition.

For example:

if(condition) {
   //create one object
} else {
   //create another object
}
someCommonMethod();
if(condition) {
   //do one thing
} else {
   //do another thing
}
someCommonMethod();

Even the code inside the conditions is shared sometimes, it's just slightly variations of it. What would be the best approach here? What would be the best Design Pattern?