Due to launch on 3 April, the service will be available to clients of financial advisers and will be offered on an execution-only basis.
The portfolios will invest in either both, or just one of, the £476m ($593.6m, €549.6m) Rathbone Multi-Asset Portfolio (RMAP) funds managed by David Coombs, head of multi-asset investment, and assistant fund manager Will McIntosh-Whyte.
The six strategies are risk-assessed and categorised as cautious, balanced, income, balanced plus, equity and equity plus and will target yields of 1.42%, 1.55%, 3%, 1.65%, 1.46% and 1.14%, respectively.
The strategies can be held within an Isa and will be available with a number of Sipp providers.
Mike Webb, group executive director of Rathbone Brothers, said: “The Rathbone managed portfolio service complements our other offerings to clients, from single-strategy funds to bespoke discretionary portfolio management.
“It’s a new service that invests in existing in-house, multi-asset funds.
“Unlike ‘model portfolio solutions’, which might only deal monthly or quarterly, and therefore miss opportunities to deal at the best prices, clients of the Rathbone managed portfolio service will benefit from the daily management of the RMAP funds, and the experience of a team that has demonstrated positive returns through different market conditions.”
The strategies will invest in RMAP Total Return, Strategic Growth, and Enhanced Growth funds.
Coombs added the strategies would aim to secure returns in real terms with growth and protection from the downside.
He said: “This year is likely to see continuing uncertainty, providing opportunities that active managers can exploit, both in stock selection and asset allocation.
“By drawing together expertise from across Rathbones and capturing the best ideas from the broadest possible global universe of individual securities and funds, we look to provide returns within a set of risk parameters.”