when i am studying bank management 6002 in sydney, some problems i cannot understand.

when i am studying bank management 6002 in sydney, some problems i cannot understand..

when i draw up cashflow ladder to calculate pvbp, the bank balance sheet also shows call deposits and overdrafts with their current rate %pa.   information also shows the zero coupon rate and par rate for time bucket of "call", then 6 months, one year and so on. i do not know how to deal with these call deposit or overdrafts. should i put them in one time bucket of "call"?  but how to calcutate the cashflow?  the value times current rates then divided by frequency, but what is the frequency? can u tell me in detail how to deal with them in time bucket or just ignore them? thank u