Data entry in HTML template

We need to improve our catalogue and do some data entry. We have a HTML template (code) to be filled up with the info. We will provide the references or the pdf of the items. The pictures will need to be uploaded for every item (one small and one large) (adjustable within our platform) About 250 items for data entry. Exemple: [login to view URL] (incomplete info) [login to view URL] (complete info) Required info for data entry includes: Description of the item (features) and important specs for each items in a tab (about 5 field) exemple of the required fields for every items [login to view URL]