You want to set a decimal tab (or right-aligning tab) at the right margin, using a dot leader. Set a left indent, a first-line indent (the same number but negative), and tab stop at the left, to get the hanging indent with the parenthetical numbers. Set a large indent at the right, long enough to accomodate your longest number, so that long description texts will wrap before they get to the number area. When typing, put a tab after the parenthetical number, and another before the budget number. Any more than two tabs in a line can cause buggy behavior. In the example, the right margin isn't constant, but is larger for very large numbers, so if you've got a siutation like that, create several paragraph styles with varying right margins.

If the gap between the dot leader and the number is important, you could try putting in em-spaces after the tab but before the number -- I can't remember if the dot tab leaders honor spaces before numbers in this kind of situation. Try it out. If nothing else works, a couple of Xs filled with the "paper" color would be an awkward kludge.

Note that in fairly recent versions of Indesign these tabs outside the right margin didn't work properly. It was a pain. But versions 5 and 6 do support this, IIRC.

I did this without tabs—just one Right Indent Tab (Shift-Tab) with a dotted underline applied to create the leader:

Here it is with invisibles showing. I used an en-space to get extra space around the leader and a negative first line indent with a soft return (Shift-Return) for the overflow line:

Looks like you've got it, though Peter's solution is much more elegant than forced line breaks. The advantage to using tabs for those left numbers is that once you get to number 10, they'll still align on the wrap. Then I usually do yet one more decimal tab at the beginning of each line, because I like list numbers 9 and 10 to align at the right, which is not only typographically correct, but keeps a consistent space between the list numbers and their text.

In my example I added another tab before the Right Indent Tab:

Note that the text has to be justified and if you were to change the column width the tab for the leader would have to be adjusted. The text also has a lot of white space characters to track—tab>number>tab>indent to here>text>en space>tab>right indent tab>number—so if your not used to that a table might be easier to control.

My third tab has an underline applied, I got the dots via underline options and it could be saved as a character style.

Don't drop the third tab marker exactly on the right indent marker—if you do it doesn't get applied. In your last capture you only have 2 tab markers. In my file you can see the third tab marker slightly to the right of the right indent marker.

Not sure, I think you have to use the underline and not the leader.

An old trick to make a leader was to set a tab beyond the right edge of the text frame in the paragraph style and apply the leader to that (I learned that from Dave Saunders).

Doesn't seem to work in this case

In my example it also drops the number down a line

2, 3... are using the underline method, and the right tab does have the leader