The phrase "a further sum" is correct and usable in written English.
It can be used when referring to an additional amount of money or resources that is being added to a previous sum.
Example: "The company has decided to allocate a further sum to the marketing budget to enhance our advertising efforts."
Alternatives: "an additional amount" or "a supplementary sum".
Parliament voted him a sum of £10,000 in 1802 and a further sum of £20,000 in 1806.
A further sum of between 100,000 and 600,000 taka is to be disbursed by the government to bereaved families at an unspecified date.
Their families received 20,000 taka (£160) for immediate funeral expenses from the local administration and later a further sum of at least 100,000 taka (£790) from a special fund set up by the Bangladeshi prime minister's office.
Its report stated: 'A further sum equal to $131,754... was used to cover the payment made on 18 February 1998 to acquire 90,895 shares in the Old Monk Company for £80,000.
The deal is structured as a one-off cash payment of £18m to Disney for its 25% stake, plus a further sum of £4.25m, which represents its share of the forecast cash balance in the GMTV business as at the year end.
Identifying victims of sexual offences is a crime under the Sexual Offences Act and carries a fine of up to £5,000, but publishers who flout the law are often ordered to pay a further sum in compensation to the victim.
The Centers for Disease Control and Prevention has developed a further cumulative sum (c-sum) method for detecting epidemics.
Sir Patrick Neill, the chairman of the Committee on Standards in Public Life, ordered the party to give back the money after it approached him to ask if it would be appropriate to accept a further large sum.
A further undisclosed sum will be paid for BeyondCore in an earn-out "based on continued employment of certain recipients following closing of the acquisition".
The transfer involved Luciano Becchio moving to Norwich, as well as Norwich paying Leeds a "further undisclosed sum".
Further, sum of strain energy release rates at a given crack growth rate of both split cracks is equal to that of a single crack under the biaxial fatigue without phase difference.
