The visiting royals will plant on Friday at the Australian War Memorial a sapling grown from the historic Lone Pine that was planted there by the Duke of Gloucester in 1934.
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The Duke and Duchess of Cambridge will also be presented with a plaque carved from a branch of the tree, an Aleppo pine that was grown from a seed sent back from Gallipoli by a Digger whose brother was killed at Lone Pine Ridge in 1915.
The events will follow the Anzac Day national ceremony, which they will attend along with Governor-General Sir Peter Cosgrove, Prime Minister Tony Abbott and Opposition Leader Bill Shorten.
Large crowds are expected at the event as well as at the dawn service, following a record attendance of 35,000 at the dawn service last year and 17,000 at the national ceremony.
Memorial director Brendan Nelson said on Tuesday he was confident the extra security for the VIP guests would not disturb the important commemoration.
Each floral tribute laid by the VIPs at the Tomb of the Unknown Soldier will contain a commemorative cross made by a primary school student.
As part of the Anzac centenary program, the memorial is aiming to place almost 100,000 crosses on overseas war graves of Australians over the next four commemorative years of the First World War.
Dr Nelson will explain to the royals the significance of the Lone Pine at the memorial.
''The royals will be ceremonially planting a sapling propagated from the tree which is now in the latter part of its life,'' he said.
The memorial will present the royal couple with three gifts.
One will be a photograph of the Duke of Gloucester standing in front of the sapling he planted in 1934.
They will also receive a small box made from the pine and specifically crafted for this event.
Mark Donaldson, VC, patron of Soldier On, a Diggers support group, and two Australian veterans from Afghanistan, will also present the duke and duchess with a Victoria Cross replica handcrafted from the tree.
Dr Nelson said a group of supporters of Soldier On left Sydney on Tuesday morning, on a fund-raiser while transporting the VC replica to Canberra.
They are raising money for the organisation, which helps personnel who have physical or psychological wounds.
The group will highlight that this year is the 60th anniversary of Remembrance Way, from Sydney to the memorial, and will pause at the VC stops on the way to pay their respects.
