1) Yes. Start with a bar chart and put all of your data on the bar chart. Now in "preview mode" right-click on one of the bars that you wan't to turn into a line. Bring up the "Series Options" dialog. Here you will see an option to "Emphasize riser as...". Choose LINE.
2) This is a bit tricky. If all else fails, you could do this with our CRChart add-in (see @FORECAST and @XY macros).
-Dan
disclaimer: I work for the company, threedgraphics.com, that makes this product. This product costs money.