Hi @cezilia_mar
Not sure if I’m understanding your query, however the 1 problem I can see in your code is this: get_field('$modelos_marca')
If you’re fetching a variable, you can drop the quotes so that it becomes: get_field($modelos_marca)
So your code might be:
$brand = get_field('brand');
$modelo_brand = "modelo_" . $brand;
if(get_field('marca')) {
echo get_field($modelo_brand);
}
Alternatively, perhaps you could clarify your problem?