Selecting A Month To Calculate Invoice

Ive created an invoice. The data is being entered on the previous sheet & then this invoice reads the data from the previous sheet through the formulas as shown below. The data that is entered, is entered contineusly everyday, so the invoice calculates the amounts from the entire data input sheet. I need to add some controll to the invoice where I can select a starting date & an ending date, and then the amounts must be calculated on the invoice according to the selected dates.

H I J
27 Qauntity: Cost: Amount:
28 55 R 185.00 R 10,175
29
30 Net amount: R 10,175
31 Vat: R 1,424.50
32 Amount Due: R 11,599.50

Invoice
[Table-It] version 09 by Erik Van Geit


RANGE FORMULA (1st cell)
H28 =SUM(Divenic!G5:G5004)
J28 =SUM(H28*I28)
J30 =J28
J31 =J30*0.14
J32 =J30+J31

[Table-It] version 09 by Erik Van Geit