Hello this is my formula fields

stringVar a := "Certificate showing the number of marks ontained by Shri/Smt/Kumari"+ChrW(13);
stringvar b:= {report1.STU_NAME};
stringvar c := "of"+" "+{report1.COLL_NAME};

a := a+ChrW(13)+ChrW(13) +c ;
a;

now i want the bold the text of

[1]{report1.STU_NAME}
[2]{report1.coll_NAME}
[3]{report1.cours_NAME}
fields
please help me in that.........if any new formula i need to create the show me the example...here no condition so please help me out...
thank you
{report1.STU_NAME}{report1.COLL_NAME}