If you always want to show stock availability in the quote stock grid go to Tools > Options > Quote.
Tick this box to show the Qty Avail column within the stock grid of a quote.
Regardless of above, you can right click within the stock grid of a quote and select Stock Availability.
This will populate the Qty Avail. column with all stock available.
The background colour of the first column will change as per below:
Green – all stock is available
Orange – some stock is available
Red – no stock is available.
