How can I add a way to track a collection of entities and flag them on/off (to signal if a process has been done to them)?

Question

My first idea is extend the partial class 'Step' which is an entity. I could add a bool property and then set that true/false as I complete processing on them.. But then every time I regenerate the DBContext after making changes to the DB won't I have to manually keep doing this? OR is some other way.. The code below explains what I am trying to do

    if ((si.StepID == 20) || (si.StepID == 23) || (si.StepID == 24))
                    {
                        //Step is a process. Each Step must be run in order
                        //get list of steps in tasks in RUN (1,2,3,4...) order
                        int stepToRun = 0;
                        var stepsInTask = InstanceExpert.GetAllStepsInTaskOrderedByRunOrder(ti.TaskInstanceID);

                        //Get which step is next to be processed
                        foreach (Step s in stepsInTask)
                        {
                            //get the stepToRun 
                            //Need to extend STEP Entity property with a bool??
                        }

                        //Take that step and run the specific function

                        if (stepToRun == 20)
                        {
                        }

                        if (stepToRun == 23)
                        {
                        }

                        if (stepToRun == 24)
                        {
                        }