Top Bars to Supports:

Top Mid-Span bars (nominal bars) stop a set distance from the support (see End Gaps in Laps, Cranks and Kicks) to allow the steel-fixer to pre-fix links to the nominal bars (Beam & Splice method).

Bot Bars to Supports:

Bottom Mid-Span bars (main bars) ) stop a set distance from the support (see End Gaps in Laps, Cranks and Kicks) to allow the steel-fixer to pre-fix links to the main bars (Beam & Splice method).

Bot sup bars use main dia:

The bottom steel at the supports uses the same diameter as the mid-span bars (main bars).

1 Bar group per zone:

Only use on set of bars per zone. i.e.  5T20 not 3T20 + 2T16.  This will negate the effect of double curtailment but simplifies the reinforcement.

Limit Support Moment & defl:

Restrict the design support moment to the value at d/2 from the support face. This also reduces the effective span for deflections check. 

No Odd bar numbers

Use 2, 4 or 6 bars but never 3 or 5. This is useful in 450 wide ground beams where a 3 bar arrangement would require a middle link leg as the the bar would be greater than 150 mm from a restrained bar

Delete short mid-bars:

If the mid span bars are less than 30% of the span then delete these short bars and re-lap as 2-bar zone.

As 1 bar if span <=

If the beam is a single span beam and is less than your set span then there will be no curtailment of reinforcement.  Just a single bar group across the full span (and bobbed if requested or required)

Omit slab top mid bars

If designing as a slab (see Beam links below) then omit mid-span top steel if there is no mid-span hogging moment.