I also had a go at this.
Added Option Explicit to all modules.
Replaced "Word Style" double quotes with "Access Style" double quotes in several places.
Obtained clean compile, code cleanup.
Fixed a dozen or so run-time errors.
Fixed cascading search combos on form LineaContinuaM.
With addition of box to ScatoleT, 81 corresponding records added to LineaT.
Set tab stops to NO for 81 textboxes on form ScatolaM.
Replaced 81 on-click procedures with one procedure on form ScatolaM.
Added error handler to all new and existing code where appropriate.
Removed criteria from some queries, as criteria better suited to put in form combo click_update procedures.
More that I don't immediately recall...
Navigation between forms is muddled. OP needs to clean up interaction between forms when opening and closing.
CellLineDB-davegri.zip