Use a custom capillary
You can manually alter a capillary, which can also then be used when creating more samples.
This will affect all samples created to date that use this capillary
Create your samples using a new standard capillary
find that capillary in the instance list and select it
scroll down and change the dimensions as desired
to alter the chemical composition, scroll back up to “instance of” and select the view button
click add new phase and type in the information required
remove the old phase from the table and ensure the fraction of your new phase is 1