<p>
  <%= f.label :stores, Spree.t(:stores)%><br />
  <% Spree::Store.all.each do |store| %>
    <%= check_box_tag "product[store_ids][]", store.id, @product.stores.include?(store) %> <%= store.name %>
  <% end %>
</p>

<p data-hook="admin_product_form_stores" class="omega two columns">
  <%= f.label :stores, Spree.t(:stores)%><br />
  <% Spree::Store.all.each do |store| %>
    <%= check_box_tag "product[store_ids][]", store.id, @product.stores.include?(store) %> <%= store.name %>
  <% end %>
</p>

Add data hook for stores to admin product form
Add data hook for stores to admin product form

This will let to customize with deface
