There are too many invoices to upload one by one. Is there a way to bulk upload invoices?

To upload data in bulk you can use Data Export Import Feature in BUSY.To upload data in BUSY in bulk ,You can import voucher from excel and to import voucher from excel make sure that you have configured your excel with all voucher details that required in BUSY.There are some steps to Import Voucher from excel: 
 Step 1: Go to administraion and Then click on Data Export Import . 
 Step 2: Now click on Import voucher from excel creation . 
 Step 3: Now select voucher type and click on configure option on the right side for create format. 
 Step 4: Select vouher type and add format by specify any convenient name and save the format. 
 Step 5: After create the format You can see the format below the concernned voucher type by click on voucher type 
 Step 6: After select the format click on configure and you will get the prompt for load default components that will be use in voucher creation after click on Yes option you can select field as per your requirements there you can see the excel column so you need to specify correct excel column name according to your configured excel sheet in which field exist in column and save the configuration. 
 Step 7: If want to create any master of account and item used in voucher then can tick on Create New Master Used in Vouchers in master creation info feild and enter all required Master Group,Tax Category,Hsn Code etc. 
 Step 8: Click on all required feild that want to pick from item master and for auto calculation. 
 Step 9: Now give Excel sheet path wherever exist in system by clikc on three dots. 
 Step 10: Now specify Sheet no. and Starting and Ending row a in their respective field or can leave End Row as zero it will import till the End Of File. 
 Step 11: Now click on Import option,your voucher will become import in BUSY.