Assuming that your mix is of 40MPa strength and it’s for foundations (reinforcement to be added separately). I would suggest that you model it following the steps below as a rough representation:
1) Clone the ‘Poured Concrete – Foundations, 40MPa’ template.
2) Change the material inputs to the following to add up into a total of 140m3 as per default template quantity.
3) Leave all other inputs as is.
4) If you wish to make this template available for public use, please submit for validation.
Let me know once you’ve created this new template!