Multiple Variable selection filtering for BEx queries

I created a web template which accesses three BEx queries. I have the same variable in all three queries so when I run the report, it pulls the data from all three queries correctly. BUT, when I change the filtering criteria within the report, only one of the query results changes, but not the other two. My question is: Is there a way to link all three queries so I can change the filtering criteria only once and have it affect all three?