Hi there,
If it is carrier oils you mean, here is a quick guide:
[link=http://www.aromaweb.com/essentialoils/carrieroils.asp]http://www.aromaweb.com/essentialoils/carrieroils.asp[/link]
I'd also recommend the Carrier oils book by Len Price, which gives full details, properties etc.
I have a chart I created myself as a cross reference. If you want to pm me with an e-mail address, I'll send you a copy - for information. I wouldn't swear it was all correct!
Nellx