BOM Item Numbers: Is there a difference between hiding and deleting a row/column?

I have a two sheet drawing of the same assembly which has100+ parts.
Each sheet has different views and the part numbers are inalpha-numeric order.

I tried to hide and delete items (rows) from the BOM on each sheetand sort starting from 1. The item numbers still have a gap.

What is the difference between Hide and Delete?

I checked out two threads "BOM Item Numbers" and Renumbering aBOM".
The "Do not change item number" check box is not checked and underthe BOM properties the items start at 1.

I created a new column and added S2 to the cell for each item Idon't want on sheet 1. Then I sorted it by this new column and thenby the part number. This worked but it is very time consuming.

Shouldn't hiding or deleting the row, then sorting with renumberingdo the trick?

One step further:

If there are 10 washers total how can I get the quantity on BOMsheet 1 to be 4 and the quantity on BOM sheet 2 to be 6 and keepthe parametrics?

Thanks,
DavidSolidworksBill Of Materials