[galaxy-dev] How to make Galaxy link to a local installed UCSC database?

Hallo every one, I am new to Galaxy, I have a idea which maybe not new to people here. I work on arabidopsis. maybe you know that UCSC do not offer the genome assembly for plant. so i will install UCSC locally and built the genome assembly for arabidopsis. this work is half done now. I also installed Galaxy, if i understand correctly, Galaxy has the link to UCSC so the user can get data from UCSC. since what i interested is arabidopsis information, I hope Galaxy can retrive data form the locally installed UCSC in future. I do not know if it is possible to make this idea come ture.maybe some of you have done it. if yes, I am gratefully if you can tell me the how to get it. many thanks, Xue