how to write a formal letter when taking over new duity/post

English as a Second Language English Vocabulary, Grammar and Idioms
1

Dear All,

Can any one help me to write a formal letter rgading below:

next week i am going to assign my duties in our site office as per HR request(Currently i am working in main office) i want to reply to HR e-mail that sould be contain “taking over my new duties & need to thank for main office director/staff”

also i am bit confution about following pharases

which sentense is correct

i will be assigning my duties in site office from next monday
i will assign my duties in site office from next monday

thanks
regards
san

2

What do you mean by ‘assign’? Give your old duties to someone else?

3

"Assign"i mean taking over new responsibilities in new office, i think the sentence should be i will be attending…

my old duties…mange data & douments in a construction company , coordinate with contractors & clients,reporting to management about submission status…

4

I will be assuming my duties in the site office next Monday.