Not unless you give the li about a class of about...
If you just change #primary-nav ul ul to have right:100% all them will come out on the left...
#primary-nav ul ul {
margin-top: 1px;
margin-left: -1px;
right: 100%;
top: 0px;
}
You can't get close to the other ul ul without using #primary-nav li.about, I think

...
And you have a reaping ID of subnav it should be a class, IDs are meant to be unique, no 2 the same, it throws an error...
Result: 0 errors / 17 warnings
line 16 column 1 - Warning: element not empty or not closed
line 469 column 1 - Warning: discarding unexpected
line 100 column 2 - Warning: anchor "subnav" already defined
line 121 column 2 - Warning: anchor "subnav" already defined
line 136 column 2 - Warning: anchor "subnav" already defined
line 145 column 2 - Warning: anchor "subnav" already defined
line 184 column 2 - Warning: anchor "subnav" already defined
line 189 column 2 - Warning: anchor "subnav" already defined
line 226 column 2 - Warning: anchor "subnav" already defined
line 247 column 2 - Warning: anchor "subnav" already defined
line 270 column 2 - Warning: anchor "subnav" already defined
line 275 column 2 - Warning: anchor "subnav" already defined
line 320 column 2 - Warning: anchor "subnav" already defined
line 347 column 2 - Warning: anchor "subnav" already defined
line 360 column 2 - Warning: anchor "subnav" already defined
line 371 column 2 - Warning: anchor "subnav" already defined
line 398 column 2 - Warning: anchor "subnav" already defined
Info: Doctype given is "-//W3C//DTD XHTML 1.0 Transitional//EN"
Info: Document content looks like XHTML 1.0 Transitional