First, you need this relationship:
WirelessPlans::__pkWirelessPlanID = QC::_fkWirelessPlanID
In each field in QC where you need data copied from a selected record in WirelessPlans, use field options to set up a Looked up Value auto-enter option, to copy data from the matching field in WirelessPlans.
To create a new quote, you create a new record in QC and use QC::_fkWirelessPlanID formatted with a value list of PlanID's and Plan names from WirelessPlans. When you select or change the value in the QC::_fkWirelessPlanID field, the looked up value field options on these fields will copy data automatically from the matching record in WireLess plans.