OpCode Search - Maintenance Group Filter

Please add an additional search filter on the OpCode Search of the appt booking screen, labelled "Maintenance Group". When selected, a user would type a word or more from the name of any maintenance group, and the results that should populate in the "Operation Code" drop down are only those that correspond to a matching maintenance group. For example, there may be a maintenance group called "Oil and Filter" and another called "Oil and Filter Diesel" If "Maintenance Group" is selected and they search "Oil" then the results in the drop down should only be OpCodes that belong to any maintenance group with the word "Oil" in the name