question: the below and above ground drip irrigation line with a diameter of 13.7 mm is installed underground where it is not visible and serves the irrigation of bordering plants and lawn areas.
Capitalize this past sentence correctly.
A: The Below and Above Ground Drip Irrigation Line with a diameter of 13.7 mm is installed underground where it is not visible and serves the irrigation of bordering plants and lawn areas.

question: several seating arrangements may be organised: theatre, school, u-shape or board meeting.
Capitalize this past sentence correctly.
A: Several seating arrangements may be organised: theatre, school, U-shape or board meeting.

question: last but not least, the process also works as a necessary management and prioritizing tool for each innovation and the whole portfolio.
Capitalize this past sentence correctly.
A: Last but not least, the process also works as a necessary management and prioritizing tool for each innovation and the whole portfolio.