How to add qty total in sale invoice

Hi can i add qty total in sale invoice. i need total in pcs only. how can i modify custom theme

The forum is not a programming guide and does not cover how to program in Liquid

There has been a few topics on this question, so using the search facility may help.

Note that in general, having a total quantity on an invoice does not make much sense when the different lines use different units eg kg, litre, unit as adding the numerical values would be a nonsense

i need only in pcs, i could not use kg, liter etc. it is possible to modify in custom theme?

I think so - but you need to program in Liquid language - either yourself or hire a programmer.

There is no guarantee that your new theme will work with future versions of Manager as there may be changes to the Manager database and/or code which will render you theme invalid

See this guide https://www.manager.io/guides/17115

Manager has only one item unit.

in inventory item you can add the unit name
image

please find the guides for more information

https://www.manager.io/guides/7551