Tangled reads Phorest's Sales Transactions export as it is.
Each line counts at its net value (after discount, before VAT/tax). Services count as service sales, products as retail, tips are kept separate, and refunds are subtracted. Vouchers and courses are not counted as revenue until they are used.
Steps from Phorest's Support Center (Sales Transactions report overview; How can I export sales transaction information to CSV). Phorest's support articles list the fields but don't give the exact column headers, so Tangled accepts common header names. If your file doesn't import, send it to us and we'll add your layout.
Your data stays yours. Files only; nothing connects to your POS.