Integration of 1C and Bitrix without harming SEO

Question on configuring 1C: Our website is fully dependent on item 1C: images, price, properties, description. When unloading at site 1C deletes the old directory and creates a new directory that changes the page of promotion (Yandex index) as a result, our position in SEO promotion remain in place and moreover fall down. Interested in how to configure with 1C sites. A site on 1C-Bitrix.
You need an understanding of what you need to do to fix and how much it will cost??