Collecting Amounts Of Time For Various Tasks And Adding In Separate Page Via Menus

I would like to create a menu representing "tasks" where an amount of "time" can be designated per option for my employees to select and fill. I would like this information to then be tallied elsewhere so I can keep track of our efficiency.

So far, I've created a table where a "time" input is nested beside each "task" drop down menu, I would like these inputs to be added up underneath the same category on the budget tab.

For example: If I work Monday, Tuesday and Wednesday doing tiling.. I would like the budget to reflect those accumulated hours (throughout the week) nested under "tiling".

Here's the file, what I'm trying to accomplish [URL] ............