Dynamic texts in static text field




hi all,

I have a requirement where in i have some values which have to be filled at run time. fo rexampl ei have a paragraph of 10 lines, but in between many lines there are dynamic texts like amounts , dates and telephone numbers to be printed. I saw in a example in SAP , they used dynamic variables like {variable}, but i am not able to do so.

And i want these, variables which come with default values from the prgram to be editable, so that the use can make changes......!!!

Can anybody help me in this.....please..!!