In CRM 2013 forms, Business Process Area is collapsed by itself during form type create. So we wrote explicit code on form load to achieve the same.

var formType = Xrm.Page.ui.getFormType();
var CREATEFORMTYPE = 1;

function onLoadBusinessProcessExpand() {
    var businessProcessArea = $(‘#processControlCollapsibleArea’);
    if (formType == CREATEFORMTYPE && businessProcessArea != null) {
        $(‘#processControlCollapsibleArea’).css({ display: “block” });
    }
}

onLoadBusinessProcessExpand function needs to be called on form load.
Hope it helps!