How to use Begin Tran,Commit Rollback in Repository pattern

I have created a project using MVC Unit Of Work Repository Pattern.

I have implemented CRUD operation using repository pattern.

I have total 4 tables like 1) Master Table, 2) to 4) Detail Table.

Now I have a bellow situation I filled all text box on above form & click on save button. By using repository I am going to Insert data one by one i.e will store data into Master Details then Details 1 to Details 4.

But after inserting data into first 2 tables, because of some wrong information tables 3 & 4 are not inserted. So in this situation I would like to revert data from Master details and Details Table 1.

How can I use Begin Transaction, commit, rollback using repository pattern.

Bellow is my code

// Insert Data for Master Details table 1
MasterDetails objMaster= new MasterDetails();
objMaster.RFQ = UserTextValue;
objMaster.CompanyCode = UserTextValue;
//other fields
UnitoffWork.MasterDetailsRepository.Insert(objMaster);
UnitoffWork.MasterDetailsRepository.Save();
// Insert Data for Details 2
Details1 objD1= new Details1();
objD1.RFQDate = UserTextValue;
objD1.Item = UserTextValue;
//other fields
UnitoffWork.DetailsOneRepository.Insert(objD1);
UnitoffWork.DetailsOneRepository.Save();
// Insert Data for Details 3
Details2 objD2= new Details2();
objD2.TargVal = UserTextValue;
UnitoffWork.DetailsTwoRepository.Insert(objD2);
UnitoffWork.DetailsTwoRepository.Save();
// Insert Data for Details 4
Details3 objD3= new Details3();
objD3.YourReference = UserTextValue;
//other fields
UnitoffWork.DetailsThreeRepository.Insert(objD3);
UnitoffWork.DetailsThreeRepository.Save();

Thanks