Its nothing but your day to day material incoming to site and daily usage.

In-stock: Materials that received to your construction site, Make a note and send a report about the materials, quantity and supplier details, it will be monitored by the company in admin console, also it is auto calculated based on the daily in-stock.

Closing stock: Make a note and send a report about the materials that were used for certain works and its description, it will be auto calculated by the system and it is projected to company admin about the Received/ Usage and Remaining stock details of the materials. It will be more helpful to determine your current usage and upcoming work requirements to plan for future stock procurement.