Knowing what fields to hide and what fields to require can be quite challenging for an administrator when they are configuring their PCR form. As for the users, knowing what fields require information while they are filling out a PCR can also be a challenge. But there is no need to worry as NEMSIS provides materials which explains what fields are needed.
To read through the NEMSIS 3 Data Dictionary which explains which certain fields are Option, Mandatory, and Required, click here: NEMSIS Data Dictionary.
For all other resources provided by NEMSIS, including the drop down fields in the PCR form which are displayed by default, visit this link: NEMSIS v3 Resources.
For more information regarding NEMSIS and their requirements, please visit their official NEMSIS website.