If I understand your data correctly, you either need to specify BY variables if you want to see each location and department combination individually, or you need to specify the accumulate= option if you want to see the total. Or both if you want to accumulate them at some other interval.
So, either, for each department and location
proc timeseries data=sale_TenDay_BuyReturn plot=series;
id date interval = Day;
var TenDay_BuyReturn;
by department location;
run;
Or, for total daily data
proc timeseries data=sale_TenDay_BuyReturn plot=series;
id date interval = Day;
var TenDay_BuyReturn / accumulate=total;
run;
Or, for monthly data per department and location:
proc timeseries data=sale_TenDay_BuyReturn plot=series;
id date interval = month;
var TenDay_BuyReturn / accumulate=total;
by department location;
run;
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