Pivot Table Size

[PCStechnical]

I have a pivot table that changes size because of the table that it
refers to is dependent on information inputed on another table.

explanation:
sheet 1 has 3 options you can input (but one column that is empty rests
between the 2nd and 3rd column, that's why I can't use a pivot table
directly with this table) regular hours, other hours, and department
number.

sheet two summarizes that table to three columns (essentially
eliminating the extra column)

Now on sheet one, when no information is inputed in a row, the results
are zeros, and the pivot table is empty. But once you enter in
information for one day, the table will grow to accomidate the new
information. Now if you input, for the second day, information (hours)
from a different department number (which is what I'm using the pivot
table to sort for) the table will grow again because there is now a new
department number.

Here's my problem: I have another sheet (sheet 3) that is a summary
sheet of all types of hours worked I can't link cells on the summary
sheet to the pivot table, because the size of the pivot table changes
with how many departments you input that week. Essentially, I may not
be able to use the same cell reference twice.

Is there any way I can keep the size of the pivot table permament, and
when new information is input, it just fills in on the table? That way,
I would know the exact cell reference each time.

Thanks