This is my form and i want to make all the select tabs in one line How and where i will write bootstrap class to make this all select box come in one row.
There is a module named field group. Download that module and then extend that. In Content type field edit form there a button will come with name of add group. Select HTML element and fill the required details and just arrange that in manage form display. U can add any css class. Then save that. Hope that will help