Buddypress Registration try

<?php /***** Extra Profile Details ******/ ?>
<?php if ( bp_is_active( 'xprofile' ) ) : ?>
<?php do_action( 'bp_before_signup_profile_fields' ) ?>
    <div class="register-section" id="profile-details-section">
        <h4><?php _e( 'Profile Details', 'buddypress' ) ?></h4>
                <?php /* Use the profile field loop to render input fields for the 'base' profile field group */ ?>
                <?php if ( function_exists( 'bp_has_profile' ) ) : if ( bp_has_profile( 'profile_group_id=1' ) ) : while ( bp_profile_groups() ) : bp_the_profile_group(); ?>
                <?php while ( bp_profile_fields() ) : bp_the_profile_field(); ?>
                    <div class="editfield">"

(all the various profile field options here)

                    </div>
                <?php endwhile; ?>
                <input type="hidden" name="signup_profile_field_ids" id="signup_profile_field_ids" value="<?php bp_the_profile_group_field_ids() ?>" />
                <?php endwhile; endif; endif; ?>
    </div><!-- #profile-details-section -->

(followed by my next profile field group)

<?php /***** Extra Profile Details ******/ ?>
<?php if ( bp_is_active( 'xprofile' ) ) : ?>
<?php do_action( 'bp_before_signup_profile_fields' ) ?>
    <div class="register-section" id="profile-details-section">
        <h4><?php _e( 'Students', 'buddypress' ) ?></h4>
                <?php /* Use the profile field loop to render input fields for the 'base' profile field group */ ?>
                <?php if ( function_exists( 'bp_has_profile' ) ) : if ( bp_has_profile( 'profile_group_id=3' ) ) : while ( bp_profile_groups() ) : bp_the_profile_group(); ?>
                <?php while ( bp_profile_fields() ) : bp_the_profile_field(); ?>
                    <div class="editfield">

(all the various profile field options here)

                    </div>
                <?php endwhile; ?>
                <input type="hidden" name="signup_profile_field_ids" id="signup_profile_field_ids" value="<?php bp_the_profile_group_field_ids() ?>" />
                <?php endwhile; endif; endif; ?>
    </div><!-- #profile-details-section -->

(and so on...)