The template voyages' various costs and revenues can be found here:
Various Cost/Revenue grid
All these rows are non-editable.
Read more about the grid's "base functionality" here.
Editing a Various Cost and Revenue
By clicking the -icon in the left-most column, you will be able to open up the Edit Various Cost or Edit Various Revenue modals for that specific row, based on the Various Type. From the below view, you can edit the selected various:
Edit Various Cost option from the Various Cost/Revenue grid view
Note that a various can be of different "usages", read more about it here here.
Changes done in the drawer will be reflected in the rows.
Additionally, you can also delete the selected Various Cost/Revenue: