A feature which I didn't know even it is available since Analysis Office 2.2 is to search and filter by attribute. First select a dimension you want to filter.
Now you see the Filter by Member dialog and you can display the necessary attribute you want to filter.
Now select in the dropdown menu the attribute you want to filter.
After you select the attribute, you can use the search bar to filter your result.
The result of the crosstab should look like the following screenshot.
So as you can see, you cannot only Filter by Member for a dimension, you can also Filter By Member for an attribute. This might be interesting for you, when you use a lot of attributes.