B7478
If you leave FXE, you will need a Class B clearance BEFORE entering the Class B airspace. FXE ground/clearance delivery should be able to get you one prior to taxi. "Request Class B clearance VFR to BCT, request x,xxx feet" Controller should come back with a clearance, traffic permitting with squawk code and altitude and any route information. The tower will hand you off to FLL radar who will work you over to BCT. They will probably just flight follow and let you fly direct, unless traffic requires a vector or restriction. FLL radar controller will hand you off to BCT tower. He will probably state, "Nxxx, leaving the Class B airspace, do you wish flight following?" You can stay with him until the hand off to BCT tower, but the rules will be different--you are not in Class B anymore. Remember, you are still VFR so cloud clearance, "see and avoid", etc.
GF