Hi Mick
I fear I may have mislead you with my instructions.
It does not matter whether there are any blank columns within your data,
or whether there are columns that you don't wish to filter.
I usually mark the complete range then Data>Filter>autofilter to be sure
that the filter is available on all columns that I wish to use, even if
some are blank within the range. You can click on any cell within your
data and choose Data>Filter>Autofilter, but if you have any blank
columns, then it will think the table only applies up to the first blank
column, and will not apply the dropdown to other columns beyond that.
Just use the dropdowns on any columns that you wish to filter by.
When a filter is applied, the small downward pointing arrow on the
filter button, turns Blue, but this can sometimes be difficult to see.
Selecting any of these Blue dropdowns and selecting All, removes the
filter on that column, but would leave it still applied to any others.
The advantage of Show All, is that it will remove all filters that had
been applied in one go, taking you back to the full set of data.
Try again with adding it to your toolbar.
View>Toolbars>Customise>Commands>Categories>Data
At this point, with Data highlit, you should see Commands in the right
hand pane of the Dialogue box.
Show All is the 5th item down.
Whilst holding your let mouse button down on Show All, drag it to the
toolbar, to a position between a couple of icons that are there, until
the cursor changes to a long black bar, then release the mouse button.
It doesn't seem to like it if you try and drop it in a blank area at the
end of the toolbar, and maybe this has been your problem.
Whilst in this Customise mode, also drag the Autofilter icon to your
toolbar, next to the Show All, then click Close.
Now when you want to apply Autofilter, just click the Autofilter button.
When you have selected a whole range of different filters and have a
smaller subset of your data showing, just click Show All to get back to
the full set, with all of the filter icons still in place.
For more help on Autofilter, take a look at Debra Dalgleish's site
http://www.contextures.com/xlautofilter01.html