Add while deleting rows? Is this possible via VBA Macro

Hello,

I have the attached workbook which in column 'p' has a number. At the end of each number there is a -xx where the xx represents a two digit number. I am only interested in the rows with -11 in however this is where is gets tricky. I would like the amount and hours that appear in column X and Y respectively to be added to the amount and hours for the -11 row; so for example if I had:

Number                  Amount Hours
FR-3418432-11        $10         50
FR-3418432-12        $10         50
FR-3418432-13        $10         50

I would like to delete FR-3418432-12 and FR-3418432-13 but before deleting add the hours and amount for these two rows to FR-3418432-11 so after it would say:

Number                  Amount Hours
FR-3418432-11        $30         150

The attached spreadsheet provides an example with the way in which the data tends to appear. I would be grateful for anyone's input to this as always.

Regards,

GISVPN
Example-WS--3.xlsx