I have seen websites that if the user wrote some specific format like this in the back-end for example :
Then in the front-end it will display (in table form):
$500
Polo Shirt
V-Neck Shirt
Pijamas
$750
Polo Shirt
Jeans
They will automatically divide items and price by a comma and just by typing number then it will automatically give a currency symbol. Also the items will be ordered based on the price.
Can Joomla do that?
Joomla can't do that by itself, but it's quite easy to implement such feature.
Anyway I'd still suggest having two separate fields in form at least for validation and type hints.
Probably you've seen in the backend that it does't let you save the form when one of the fields is invalid and it marks the field border with red color.
If you are after speed in filling in forms, use tab
button.