Hi there. I am working on music that has a D(add11) chord. How do I enter this into BIAB?

I understand that BiaB doesn't have support for D(add11)

You could try Dsus or D9sus. This will give you the required G note, but at a 4th interval, not 11th.

And BIAB allows you to key in D11. Whether it displays as D11 or D9sus depends on the setting in Display Options.

Try a C/D

BIAB team can you please include the add9 and add11 in the future?

Put this on the wish list and you will get a +1 from me.

For add 9 I use 2 (Cadd9=C2) in most cases it gives satisfactory results.

Insights and incites by Notes

BIAB converts that to C2 anyway.