Can someone tell me if it is possible to create barcodes in clac which I can asssign to stock items for my inventory file?
what is clac? Barcodes can also be generated with python macro language, for an example see link text
There is an (apparently) QR-Code extension that provides a GENBARCODE() function in Calc, and an older Barcode extension that claims to do such things in Draw (from which you could copy the generated image and paste). However, if you need something else than QR-Code, then a dedicated barcode generator application may be better suited, such as Zint Barcode Generator.
And btw, please don’t post questions as wiki, thanks.