Copying a row of data based on a category

Hi,

I am trying to develop a spreadsheet (attached to this post), what I would like to do in the Contents tab is have a drop down list in every cell from A2 downwards (only in column A though). When clicking on this drop down list it will display all the categories that are listed in the Category tab (this list may increase). When the user selects a category from this list it is displayed in column A on the Contents tab.

What I want to do then is for whatever data I put in each row is copied to the tab that relates to the category.

So for example, let's say my first entry is that on the Contents Tab in Cell A2 there's a drop down and I choose Photos (which is one of the categories list on that tab), I then type date in columns/cells: B2, C2, D2 etc then everything from A2 to D2 (or beyond that to even Y2) is copied to the photos tab from column A onwards. My further issue is that if I then enter another Photo category, I want it to again copy the data but put it under the line that's already been copied there from the previous entry. Bascially, everything entered into the Contents tab is all copied to the appropriate tabs. The contents tab shows all entries.

I hope that makes sense!

Thanks,
Lew