Inventory Item Grouping

Is it possible to add manufacturer groups and their items when invoicing, Products from same manufacture name are to be listed by simply typing manufacturer name or group name, And can we add product quantity units like “dozens” “Bundle” "box’’ etc.

No.

can we add product quantity units like “dozens” “Bundle” "box’’ etc.

Yes. Enter these in the Unit Name field for the inventory items.

Not added when invoicing but could be done when the Inventory Items are created.
Foe example, if the manufacturer is Apple, you could add Ap as a prefix to their items.