Put your matching items from your database collection into a dropdown and then use onChange to filter the dataset
export function breadDD_change(event) {
let bread = $w("#breadDD").value;
filter(bread);
}
let FilterDataset1;
function filter(bread) {
if (FilterDataset1 !== bread) {
let newFilter = wixData.filter();
if(bread)
newFilter = newFilter.eq('breadName', bread);
$w('#dataset2').setFilter(newFilter);
FilterDataset1 = bread;
}
}