Small improvements to the site on Yii2

Good afternoon! We need to refine the site on Yii2, namely:

1. Make it possible to create a root menu item without the obligatory reference, the links will only be in nested paragraphs.
2. Solve the problem of mass editing of goods (in particular the removal of unnecessary goods and product groups).

Write your offers at once with an approximate price tag or a price break, the price per hour is not necessary to write.
Work without prepayments and safe deals.